Nontrivial berry phase. This kind of phase factor is called dynamical phase.
Nontrivial berry phase 5 P, quantum oscillations revealed multiple Fermi pockets. Topics including the adiabatic theorem, parallel transport, and Wannier functions are reviewed, with a focus on the connection to topological insulators. Systematic Fermi surface and band calculations combined with Berry phase analysis confirm the nontrivial topological character of this material (with a Berry phase approaching {\pi}). 1088/1361-648X/ab9859 Authors: Mar 6, 2020 · The Berry phase, , is a signature of nontrivial band topology, and in TNLSMs with combined inversion and time-reversal symmetry , the Berry phase along any closed contour in momentum space is either 0 or . We explore the intrinsic link between the emergence of a non-trivial Berry phase and . Oct 17, 2024 · The Berry phase is a fundamental concept in quantum mechanics with profound implications for understanding topological properties of quantum systems. Specifically, in condensed matter theory and for a crystalline material with a set of isolated (gapped) electronic bands, the partial derivatives along momentum - vectors of the Jan 6, 2025 · The higher Berry phase for one-dimensional invertible states can be introduced through the triple inner product and furthermore the topological invariant, which takes its value in $ {\mathrm {H}}^ {3} (X;\mathbb {Z})$, can be extracted. Recent experimental and theoretical studies suggest that spontaneous translation symmetry breaking in some two-dimensional materials with nontrivial quantum geometry (e. R. As such it is important to perform further studies to reveal the origin of this nontrivial Berry phase. The analysis of Shubnikov-de Haas (SdH) oscillations provides evidence for a non-zero Berry phase, indicating a non-trivial topology of the α-band. Dec 22, 2022 · The existence of the optical Berry phase in all-dielectric Möbius-strip cavities is experimentally confirmed. May 15, 2018 · Dirac nodal-line semimetals with the linear bands crossing along a line or loop, represent a new topological state of matter. The Shubnikov-de Hass oscillations of early zero effective ma nontrivial Berry phase. The sample doped with 5% Gd undergoes a transition from negative MR to positive MR due to a presence of mixed magnetic state resulting from the opening of a gap at the Dirac point. These results demonstrate an unique example of the Fermiology in the antiferromagnetic state and opens up a new paradigm to explore the Dirac fermion physics in correlated topological metal Mar 21, 2025 · This research establishes a theoretical link between far-field polarization geometry and band topology in non-Hermitian systems, enabling Berry curvature observation through polarimetry Jul 5, 2017 · Here, we report an experimental realization of type-II Dirac fermions in by angle-resolved photoemission spectroscopy combined with ab initio band calculations. Xia and 10 other authors Berry's phase (1, 2) is an example of holonomy, the extent to which some variables change when other variables or parameters characterizing a system return to their initial values (3, 4). We obtain this result for a one-dimensional, periodic sawtooth potential, though our analysis is applicable to other systems. Here, by carrying out magnetotransport measurements and performing first-principle calculations, we demonstrate that such a state has been realized in high-quality single crystals of SrAs 3. Fig 3a displays the magnetization versus magnetic field (B∥c) for PdTe2 at 1. China Nontrivial Berry Phase and Type-II Dirac Transport in Layered Material PdTe2 Mar 5, 2024 · However we note that these calculations assume a Sm valence of 3+, while a mixed valence of about 2. Nov 18, 2011 · Ever since the novel quantum Hall effect in bilayer graphene was discovered, and explained by a Berry phase of 2 𝜋 [K. The conventionally known phase factor is dependent on the system’s energy and evolves over time. To illustrate this idea, we Jul 16, 2025 · Subse-quently, Sec. These results together with band structure calculations unambiguously give evidence of the chiral anomaly effect and are valuable for understanding the Weyl fermions in magnetic lanthanide half This sharp contrast arises from the phase-space Berry curvature (BC) of Bogoliubov quasiparticles, a novel quantum geometric property that generalizes the conventional momentum-space BC. This work paves way for the synthesis of high-mobility Te structures and sheds light onto the intrinsic nontrivial topology of the attractive elemental substance. To confirm the nontrivial Berry phase, we have measured the Hall resistivity at various temperatures and fields. Matter 32 405602 An observable consequence of the nontrivial Berry phase is the existence of localized states at the boundaries when we terminate a system with boundaries. Sep 25, 2025 · In this study, we combine systematic electrical transport experiments with first-principles calculations to investigate the possible realization mechanisms of topological semimetal states in CrSb and their manifestations in quantum transport phenomena. 2, 177 (2006)], it has been widely accepted that the low-energy electronic wave function in this system is described by a nontrivial Berry phase of 2 𝜋, different from the zero phase of a conventional two-dimensional electron gas. In contrast to a predicted sole Berry phase value of π, arbitrary values of the Jul 5, 2013 · Berry's phase has direct relevance for Topological Insulators. Our work shows the rst evidence for the topological nature of the bulk carriers in BiPd and provides motivation to further study the nature of the bulk multiband superconductivity and detailed con-ditions The phase shift γ δ includes a geometric component γ = 1/2 - Φ / 2 π, where Φ is the Berry phase, and a dimensional correction δ, which takes the values of 0 in two-dimensional systems, and ± 1 8 in three-dimensional cases [57]. Under external electric field this gives rise to the net motion of charge. , Nat. 6 K. Nov 24, 2016 · Here we report the evidence of the type II Dirac Fermion in the layered crystal PdTe2. To illustrate this idea, we 1Nanoscale Physics and Device Laboratory, Institute of Nano Science and Technology, Phase- 10, Sector- 64 Mohali, Punjab - 160062, India. May 16, 2022 · When a small gap is opened at a linear band crossing, the presence of Berry curvature may still lead to a non-trivial Berry phase along an enclosing path, as illustrated by the Möbius strip. Aug 27, 2018 · Topological materials exhibit a nontrivial Berry phase, experimental determination of which heavily relies on a straightforward phase analysis of quantum oscillations. Here, we studied the electronic properties of high-quality single-crystalline SmBi employing magnetic and Jul 9, 2018 · Here we observe anomalous behavior in the quantum oscillations of one member of this family, antiferromagnetic SmSb. g Download scientific diagram | Quantum oscillations and non-trivial π Berry’s phase in pressure-induced 2D Te Weyl semimetal phase Back-gate voltage Vg dependence of the Shubnikov-de Haas (SdH Here we report the evidence of the type II Dirac Fermion in the layered crystal PdTe2. 1 1 𝑚 0. These results indicate that Nb_3Sb superconductor is also a semimetal with large MR and nontrivial Berry phase. These results indicate that Nb 3 Sb superconductor is also a semimetal with large MR and nontrivial Berry phase, indicating that Nb 3 Sb may be another platform to search for Majorana zero-energy mode. Several features are worth noting. This also means a nonvanishing density of states in the whole Dirac cones, which makes PdTe 2 an improved platform for possible topological superconductors and Majorana fermions Sep 26, 2016 · Our experimental results indicate that the band structure consists of Dirac bands with low cyclotron mass, a non-trivial Berry phase and parabolic bands with a higher effective mass and trivial Jun 23, 2025 · We present an extension of Landau’s theory of phase transitions by incorporating the topology of the order parameter. First-principles calculation reveals that the nontrivial Berry phase originates from a hole pocket formed by the tilted Dirac cone. Berry phase has infinite order i. 0 3 4 𝑚 0, while the 𝛽 pocket has a trivial Berry phase with an effective mass of ∼ 0. Aug 3, 2022 · Pulsed magnetic field measurements up to 57 T disclose a quantum linear MR beyond the quantum limit and the Landau fan diagram clearly reveals a topologically nontrivial π Berry phase. IV calculate the anomalous Hall conductivity arising from TRSB and nontrivial Berry curvature. Berry in 1984 [1], which characterizes adiabatic evolution of quantum systems and emergence of a phase factor, (different than the Nov 18, 2011 · Ever since the novel quantum Hall effect in bilayer graphene was discovered, and explained by a Berry phase of 2 𝜋 [K. Angle Resolved Photoemission Spectroscopy demonstrates a type II Dirac cone Our findings of unusual quantum oscillations in an antiferromagnetic, mixed valence semimetal with a non-trivial Berry phase can provide an opportunity for studying the interplay between topology, electronic correlations and magnetism. Jun 26, 2025 · Idea 0. 17–19 It is then tempting to ask if there is any connection be-tween these two paradigms in quantum physics, namely en-tanglement and the Berry phase. In Nb 0. Signature of a non-trivial Berry phase is discovered for the F α Fermi-pocket, suggesting the nontrivial topological character. We study a variety of examples including free electromagnetism More about this open access article on DOAJ. Here we report the evidence of the type II Dirac Fermion in the layered crystal PdTe2. Dec 1, 2022 · Electrons in the Dirac band acquire a π Berry's phase after completing a closed trajectory around a Fermi surface. Sep 12, 2024 · We conducted an analysis of Shubnikov–de Haas (SdH) oscillations to investigate the Fermi surface evolution and the presence of a nontrivial Berry phase in all three compounds. S. Our work shows magnetic-semimetal BaMnSb2 exhibits nearly zero-mass fermions with high mobility and a non-trivial Berry phase. 7 K. The analysis of Shubnikov-de Haas (SdH) oscillations provides evidence for a non-zero Berry phase, indicating a non-trivial topology of the $\alpha$-band. Berry in 1984 [1], which characterizes adiabatic evolution of quantum systems and emergence of a phase factor, (different than the Jun 10, 2025 · The Berry Phase is essential in understanding the behavior of quantum gates, as it affects the phase accumulated by the qubits during the gate operation. Our work shows magnetic semimetal BaMnSb 2 exhibits nearly zero-mass fermions with high mobility and a nontrivial Berry phase. What is unique is the magnetic ordering, indicating the system is Weyl type due to time-reversal symmetry breaking. Berry (1984). We explore the intrinsic link between the emergence of a non-trivial Berry Aug 14, 2019 · Observation of Shubnikov-de Haas Oscillations, Non-trivial Berry Phase, Planar Hall and Anisotropic Magnetoresistance at the conducting interface of EuO-KTaO$_3 Mar 3, 2025 · The study of topological semimetals have attracted tremen-dous interests due to their novel electronic structure and un-conventional transport properties in condensed-matter physics in recent years [1–3], such as large longitudinal magnetore-sistance, high mobility, nontrivial Berry phase and chiral-anomaly induced negative longitudinal MR [4–10]. Jan 29, 2019 · Crucially, the analysis of the phase of the oscillations re-vealed a non-trivial Berry phase associated with the car-riers in this pocket. Such a chemical alteration would also remove the resonant state discussed previously, leaving a single ring in the surface FS which carr es a π Berry’s phase. III is followed to compute the Berry curva-ture and Chern number, and perform a detailed analysis of the topological phase transitions as well as provide the overall phase diagrams. Treated along these lines our data in Fig. These pioneering studies16,17 have significantly influenced the community working on the novel physics of graphene nanostructures, and the concept of a nontrivial Berry phase in the Jun 2, 2020 · A comprehensive, angle-dependent analysis of the phase of the SdH oscillations convincingly demonstrates a nontrivial Berry phase for two bands along Γ − 𝑅, supporting the theoretical predictions, while simultaneously evidencing interference between extremal orbits that mimics a trivial Berry phase at intermediate angles. Jul 5, 2017 · They found evidence of type-II Dirac points in a nontrivial Berry phase associated with so-called De Haas-van Alphen oscillations in the magnetization data. In this work, we report a hidden Berry phase in Weyl semiconductor Te nanowires. Our study further confirmed the topological characteristics of nodal-line semimetal ZrAs 2. May 2, 2019 · The analysis of Shubnikov-de Haas (SdH) oscillations provides evidence for a non-zero Berry phase, indicating a non-trivial topology of the α-band. Angle Resolved Photoemission Spectroscopy demonstrates a type II Dirac cone Jul 30, 2021 · The nonzero Berry phase obtained from the de-Hass van Alphen (dHvA) oscillations demonstrates that Nb 3 Sb is topologically nontrivial. When the order parameter comprises several components arising from multiplicity in the same irreducible representation of symmetry, it can possess a nontrivial topology and acquire a Berry phase under the variation of thermodynamic parameters. Jul 9, 2018 · Download Citation | Anomalous quantum oscillations and a non-trivial Berry phase in SmSb | We provide evidence for anomalous behavior in the quantum oscillations of the antiferromagnetic semimetal The in-plane electrical conductivity is defined by σab =ρab=ðρ2 ab + ρ2 xyÞ, meaning that the phase of oscillatory Δσab is not necessarily the same as Δρab. Thus, values fo j - j, with a nontrivial -Berry phase are 0 for 2D and 1/8 for 3D Fermi surfaces. 75 was reported from x-ray photoemission spectroscopy campagna1974 . Jul 8, 2025 · Explore the Berry phase and its impact on materials science and quantum systems. In this review, we introduce the concepts of the Berry phase and quantum oscillations, and provide some classification of topological materials. Specifically, in condensed matter theory and for a crystalline material with a set of isolated (gapped) electronic bands, the partial derivatives along momentum - vectors of the Oct 16, 2020 · Both the observation of negative magnetoresistance for magnetic field along the current direction and the nonzero Berry phase in de Haas--van Alphen measurements indicate that pairs of Weyl points appear in $\mathrm {Mo} {\mathrm {O}}_ {2}$, which may be due to the crystal symmetry breaking. The imaginary part of the geometric tensor can be related to the Berry curvature 2-form on the Hermitian principal line bundle (for more details see Refs. The Berry phase was determined by extrapolating the observed dHvA oscillations to the zero-energy Landau level using the Landau fan diagram. Using a Landau level fan diagram analysis, a non-trivial Berry phase is identified for a Fermi pocket revealing the topological character in this material. Dec 12, 2023 · Thus, the nontrivial Berry curvature can be concealed by the spin-zero effect, resulting in an apparent trivial phase in quantum oscillation measurements. Download scientific diagram | Quantum oscillations and non-trivial π Berry’s phase in pressure-induced 2D Te Weyl semimetal phase Back-gate voltage Vg dependence of the Shubnikov-de Haas (SdH Dec 1, 2019 · The analysis of Shubnikov-de Haas (SdH) oscillations provides evidence for a non-zero Berry phase, indicating a non-trivial topology of the α-band. In ma y d-electron systems, th Berry phase is gauge invariant → potentially observable. Dec 10, 2020 · View a PDF of the paper titled Evidence of non-trivial Berry phase and Kondo physics in SmBi, by Anup Pradhan Sakhya and 3 other authors Apr 10, 2017 · Non-trivial Berry phase and chirality are important markers for characterizing topological aspects of Weyl semimetals. In every case there exists a Jun 13, 2017 · The Shubnikov-de Hass oscillations of the magnetoresistance give nearly zero effective mass with high mobility and the nontrivial Berry phase. We report here the Shubnikov-de-Haas oscillations (SdH) at the conducting interface of EuO-KTaO$_3$ (KTO Select any part of the paper to ask specific questions Apr 29, 2024 · This question is about the original paper on Berry phases by M. The concomitant phase inversion underlines a largely overlooked phase factor in previous oscillation analysis of The in-plane electrical conductivity is defined by σab =ρab=ðρ2 ab + ρ2 xyÞ, meaning that the phase of oscillatory Δσab is not necessarily the same as Δρab. This indicates that Nb_3Sb may be another platform to search for the Majorana zero-energy mode. 8K. 1088/1361-648X/ab9859 Authors: Jun 26, 2025 · Idea 0. There, the Berry phase ϕB ϕ B is defined as Feb 27, 2017 · The Berry curvature is essential to the study of the topological properties of a system, be it solid-state, atomic or photonic. Figs. 5 Ta 0. The presence of electron correlation makes the system even more exotic due to enhanced scattering of charge carriers, Kondo screening, etc. Apr 1, 2022 · The properties of a topological insulator are characterized by a few quantities, such as the Berry phase, the Berry connection, and a topological invariant, namely, a Chern number or a TKNN invariant. 4A displays ρxy versus H. Beyond the traditional understanding that the topological phase with a nonzero Chern number supports a pair of chiral edge states, we find that the anisotropic 2D lattice also has a topologically nontrivial phase with a zero Chern number but nonzero Berry curvature. The ordered magnetic arrangement (ferromagnetic ordering in the ab plane and antiferromagnetic ordering along the c axis below 286 K) breaks the time- an ideal platform to study a centrosymmetric material. It provides free access to secondary information on researchers, articles, patents, etc. Electrons in the Dirac band acquire a π Berry's phase after completing a closed trajectory around a Fermi surface. These phases distinguish between trivial and nontrivial topologies of the elastic bit, with the zero Berry phase indicating pure states of the linearized granular system and the nontrivial π phase representing equal superposed states. The concomitant phase inversion underlines a largely overlooked phase factor in previous oscillation analysis of Aug 12, 2024 · Additionally, a nontrivial Berry phase 𝜋 \pi italic_π has been estimated for the small Fermi pocket near the Dirac point, confirming the Dirac nature of PdTe Dec 31, 2022 · Berry phase analysis via quantum oscillation is a powerful method to investigate the nontrivial band topology of topological materials. The nontrivial Berry phase in correlated oxide heterostructures has been highly attractive due to the Rashba spin–orbit interactions originating from the inversion symmetry breaking at the heterointerfaces. In this paper, we introduce an inner product of four two-dimensional invertible quantum many-body states. remains nontrivial in any N-copy systems Parity anomaly has order 2: no anomaly by taking 2 copies, only robust against (2) sym preserving perturbation The Berry phase (also called the ‘geometric phase’), a non-integrable phase factor originating from a non-trivial evolution of a physical sys-tem in parameter space1, plays a fundamental role Oct 18, 2019 · A prominent example is the Berry’s phase (12 – 14). We show that this result is due to both the periodicity of the time-independent wave function and the effects of interband degeneracies. At certain fractional llings, a gapped phase with a lling-dependent ground state degeneracy, and fractionally charged quasi Berry phase analysis via quantum oscillation is a powerful method to investigate the nontrivial band topology of topological materials. Finally the in situ rotation of the sample reveals that the Fermi surface is a weakly anisotropic ellipsoid. The Berry phase is an important idea in quantum mechanics that helps to Jun 23, 2025 · We present an extension of Landau’s theory of phase transitions by incorporating the topology of the order parameter. -3 and 5 suggest that the undoped material should have a band gap of about 0. Dec 11, 2008 · View a PDF of the paper titled Electrons on the surface of Bi2Se3 form a topologically-ordered two dimensional gas with a non-trivial Berry's phase, by Y. The macroscopic polarization of a crystalline dielectric is best defined as a Berry phase of the electronic Bloch wavefunctions, a feature that is best exemplified by the spontaneous polariza tion of a ferroelectric crystal for which a microscopic theory was previously unavailable. Berry phase analysis via quantum oscillation is a powerful method to investigate the nontrivial band topology of topological materials. (For reference, the original paper is here (pdf), a nice talk about this is here, and reviews on how this shows up in electronic properties are here and here. We report the observation of a striking spin-zero effect in quantum oscillations of topological materials. It can be shown that the nontrivial topology of the bulk-bands results in a non-trivial Berry's phase. The effect of this phase-space BC can also be detected by the differential conductance away from the boundaries. Aug 14, 2019 · View a PDF of the paper titled Observation of Shubnikov-de Haas Oscillations, Non-trivial Berry Phase, Planar Hall and Anisotropic Magnetoresistance at the conducting interface of EuO-KTaO$_3$, by Nand Kumar and 4 other authors Dec 1, 2022 · In particular, the nontrivial Berry's phase is caused by band touching points, such as Dirac nodes, and manifests as observable effects in the Shubnikov-de Haas (SdH) oscillations. Large Magnetoresistance and Nontrivial Berry Phase in Nb 3 Sb Crystals with A15 Structure Citing article Sep 2021 Qin Chen First-principles calculation reveals that the nontrivial Berry phase originates from a hole pocket formed by the tilted Dirac cone. Oct 8, 2018 · Nevertheless, it has been shown recently in both theory and experiments that nontrivial Berry phase effects can give rise to negative LMR in topological insulators even in the absence of chiral Jul 15, 2024 · The Berry phase is a fundamental concept in quantum mechanics with profound implications for understanding topological properties of quantum systems. , in science Mar 14, 2024 · The Berry phase was unambiguously characterized by extrapolating the observed dHvA oscillations to the zero-energy Landau level using Landau fan diagram. Here, we Jul 5, 2017 · Here, we report an experimental realization of type-II Dirac fermions in by angle-resolved photoemission spectroscopy combined with ab initio band calculations. This tutorial provides a comprehensive introduction to the Berry phase, beginning with the essential mathematical framework required to grasp its significance. In addition, the band dispersion measured with angle-resolved photoemission spectroscopy is found to be consistent with that of a type-II Dirac cone dispersion. 077nm-2 with a nontrivial Berry phase. Interestingly, PdTe2 PdTe 2 is superconducting at temperatures below 1. The ordered magnetic arrangement (ferromagnetic ordering in the ab plane and antiferromagnetic ordering along the c axis below 286 K) breaks the time-reversal symmetry, thus offering us an ideal platform Dec 1, 2022 · In particular, the nontrivial Berry's phase is caused by band touching points, such as Dirac nodes, and manifests as observable effects in the Shubnikov-de Haas (SdH) oscillations. Article "Coexistence of Kondo effect and non trivial Berry phase in Gd doped Bi<sub>2</sub>Se<sub>3</sub>: an ARPES and magneto-transport study" Detailed information of the J-GLOBAL is an information service managed by the Japan Science and Technology Agency (hereinafter referred to as "JST"). This kind of phase factor is called dynamical phase. The dHvA oscillations and the nontrivial Berry phase The nontrivial Berry phase is demonstrated by the dHvA measurement after we measure the magnetization condition of the PdTe2 flakes under low temperatures. Berry Phase and Quantum Gate Operations Quantum gate operations involve the manipulation of qubits through a series of controlled rotations and interactions. Abstract The Berry phase is a fundamental concept in quantum mechanics with profound implications for understanding topological properties of quantum systems. CAS-Shanghai Science Research Center, Shanghai 200031, P. An electron in a cyclotron orbit enclosing that Dirac point in the reciprocal space gains a "Berry phase". Jan 25, 2019 · The 𝛼 pocket has a nontrivial Berry phase and a small effective mass of ∼ 0. Despite the theoretically predicated nontrivial π Berry phase in Rashba systems, its experimental detection among all Rashba oxide interfaces remains elusive. Abstract When continuous parameters in a QFT are varied adiabatically, quantum states typically undergo mixing—a phenomenon characterized by the Berry phase. Berry’s phase [1] remains a productive area of research calculate the Berry phase is that it is not affected by the in a wide variety of disciplines [2,3], including molecular normalization of u [19]. We also find, for the sawtooth Jul 9, 2018 · Here we observe anomalous behavior in the quantum oscillations of one member of this family, antiferromagnetic SmSb. A signature of a nontrivial Berry phase is discovered for the F Fermi pocket, suggesting β a nontrivial topological character of the material. e. The in-plane electrical conductivity is defined by σab =ρab=ðρ2 ab + ρ2 xyÞ, meaning that the phase of oscillatory Δσab is not necessarily the same as Δρab. Aug 20, 2025 · The phase factor is a fundamental quantity present in all physical wave systems, ranging from classical to quantum cases. In addition to this, another phase factor known as the Berry phase (also called geometrical phase) emerges in Jun 1, 2020 · Breakdown of Ohm’s law and nontrivial Berry phase in magnetic Weyl semimetal Co3Sn2S2 June 2020 Journal of Physics: Condensed Matter 32 (40) DOI: 10. For exam-dynamics [7]. Using the Chern-Gaussian-Bonnet theorem [41], the Berry curvature can be used to calculate the Berry phase, which is the topological invariant used in the first approach. Our experimental finding shows the first example that has both superconductivity and type-II Dirac fermions, which turns the topological material research into a new phase. In these materials, the topological next-generation information technologies [6, 7]. Sep 1, 2015 · We present magnetotransport measurements performed on Cd 3 As 2 samples. 1 Generally, a Berry phase is a non-trivial phase picked up by a quantum state of definite energy under adiabatic changes of the quantum system ‘s Hamiltonian around a loop in its parameter space. 3 eV which is sufficient to keep it insula The nontrivial Berry phase of the hole pocket is also displayed. Other superposed states acquire different Berry phases. The non-interacting band structure is characterized by a symmetry protected topologically quantized Berry phase. Jul 1, 2020 · Shubnikov de Haas (SdH) oscillation measurement has unveiled the multiple sub-bands on the Fermi surface that corresponds to a non-trivial Berry phase. V. We explore the intrinsic link between the emergence of a non-trivial Berry phase and Jul 5, 2017 · Nontrivial Berry Phase and Type-II Dirac Transport in Layered Material PdTe2 Fucong Fei1, Xiangyan Bo1, Rui Wang1, Bin Wu1, Juan Jiang2, Dongzhi Fu1, Ming Sep 5, 2022 · The nontrivial Berry phase in correlated oxide heterostructures has been highly attractive due to the Rashba spin–orbit interactions originating from the inversion symmetry breaking at the heterointerfaces. Surface and bulk properties of BaMnSb2, a topological semimetal with non-Trivial Berry Phase Aug 3, 2022 · Here the Shubnikov–de Haas (SdH) oscillations with a nontrivial π Berry phase and the quantum linear magnetoresistance (MR) in as‐synthesized high‐mobility Te single crystals are reported. DOAJ is an online directory that indexes and provides access to quality open access, peer-reviewed journals. Systems with the "Rashba effect" possess a Dirac point in momentum space. Thereafter, we within Sec. The non-linear behaviour in Hall resistivity validates the existence of two type of charge carriers with equal electron and hole densities. The de Haas-van Alphen oscillations find a small Fermi pocket with a cross section of 0. Sep 5, 2022 · Despite the theoretically predicated nontrivial π Berry phase in Rashba systems, its experimental detection among all Rashba oxide interfaces remains elusive. In anomalous Hall metals, the Berry’s phase on the Fermi surface determines the (unquantized part of the) anomalous Hall conductivity (15, 16); nontrivial π Berry’s phase enforces the absence of backscattering in topological materials (17). We initiate a systematic analysis of the Berry phase in QFT using standard quantum mechanics methods. This novel quantum Hall effect in bilayer graphene has = been explained by the appearance of a nontrivial Berry phase of 2π in the electronic wave function,16,17 different from the case of a conventional 2DEG. First-principal calculations reveal that it is originated from the hole pocket of a tilted Dirac cone. The third-order anomalous Hall effect (TOAHE) driven by Berry connection polarizability in Dirac materials offers a promising avenue for exploring quantum geometric phenomena. If the value of gm*>>2, RS an impart a phase shift in the oscillations, although the Berry phase may be zero. Jan 25, 2020 · \pi$ phase difference between Hall oscillation and SdH oscillation and non trivial Berry Phase in a topological insulator January 2020 Authors: Debarghya Mallick Jun 2, 2020 · Besides the negative MR effects, we have further observed a nontrivial Berry phase (∼π) extracted from Shubnikov–de Haas oscillation in HoPtBi. We show that a non-trivial Berry phase appears in many familiar QFTs. Dec 4, 2024 · Systems such as Wigner crystals and incommensurate charge density waves that spontaneously break a continuous translation symmetry have unusual transport properties arising from their ability to slide coherently in space. Contrary to conventional topological insulators, the gap closing in the corresponding stub SSH chain is not accompanied by a topological phase transition. The concept of Berry phase was initially proposed by M. Interestingly, the Berry phase nk physics [4], nuclear physics [5], optics [6], and spin-wave does depend upon one’s choice of origin [20]. A metal-insulator transition driven by the magnetic field is also observed for B < 1 T. Superconductivity is another condensed-matter phenomenon that has a direct analog with high-energy physics. 0. The pure sample displays the highest magnetoresistance (MR) of around 225% and demonstrates quantum oscillations driven by a nontrivial berry phase. Novoselov et al. We investigate the role of impurity scattering on TOAHE using the semiclassical Boltzmann framework, via a comparison of the intrinsic contributions (stemming from the Berry connection polarizability) with the extrinsic Dec 16, 2018 · 发布时间：2018-12-16 南京大学物理学院、电子学院、上海科技大学、牛津大学和上海交通大学合作的课题组在第二类狄拉克半金属材料PdTe2研究中取得新进展。相关研究成果以《层状材料PdTe2中的非平庸Berry相位及第二类狄拉克输运性质》（Nontrivial Berry phase and type-II Dirac transport in the layered material PdTe2 Oct 22, 2024 · Particularly, $ {T}_ {3}$ ZR exemplifies a topologically nontrivial system with zero Berry phase. Phys. Sep 25, 2025 · Under high magnetic fields, we observe pronounced Shubnikov-de Haas (SdH) quantum oscillations and discernible Zeeman-effect-induced band splitting at 1. Feb 28, 2025 · The nontrivial π Berry phase and the chiral anomaly induced NMR suggested its nontrivial topological characteristic. The analysis of Shubnikov-de Haas (SdH) oscillations provides evidence for a non-zero Berry phase, indicating a non-trivial topology of the α -band. Here, we report a nontrivial Berry phase at the interface between γ-Al 2 O 3 and SrTiO 3 as evidenced by the quantum oscillations. Here, we Aug 14, 2019 · The momentum dependent splitting of spin-bands in an electronic system is known as the "Rashba effect". Jan 25, 2020 · View a PDF of the paper titled $\pi$ phase difference between Hall oscillation and SdH oscillation and non trivial Berry Phase in a topological insulator, by Debarghya Mallick and 2 other authors The nonzero Berry phase obtained from the de-Hass van Alphen (dHvA) oscillations demonstrates that Nb_3Sb is topologically nontrivial. Nov 1, 2018 · We consider a topologically non-trivial at band structure in one spatial dimension in the presence of nearest and next nearest neighbor Hubbard interaction. The topol-ogy of skyrmions also induces nontrivial real space Berry phases for electrons moving in skyrmion backgrounds -this Berry phases acts as an emergent U(1) gauge field inducing a ‘topological Hall effect’ (THE) [8–12] Itin-erant electrons moving in skyrmion crystal background form B , and or minimal and - for a maximal cross section of the constant energy surface) [24]. Here, we report a Breakdown of Ohm’s law and nontrivial Berry phase in magnetic Weyl semimetal Co3Sn2S2 To cite this article: V Nagpal and S Patnaik 2020 J. May 11, 2022 · Abstract In these notes, we review the role of Berry phases and topology in noninteracting electron systems. An observable which cannot be cast as the expectation values of any operator ! In analogy to electrodynamics → express the gauge invariant Berry phase in terms of a surface integral of a gauge invariant quantity Berry curvature. Weyl semimetal with a 2D electronic structure. Nov 21, 2011 · We find a non-trivial Berry phase for a finite potential, even in the delocalized-electron limit. ) cal potential downwards. Several experimental efforts focusing on three-dimensional (3D) systems have shown evidence of the expected nontrivial Berry's phase of π, particularly in the event of SdH oscillation. May 18, 2021 · Realization of semimetals with nontrivial topologies such as Dirac and Weyl semimetals has provided a boost to the study of these quantum materials. In 1D photonic lattices there is a new clever way of measuring the Jan 29, 2019 · Further analysis revealed a nontrivial 𝜋 -Berry phase is associated with the 40 T pocket, which strongly supports the presence of topological states in bulk BiPd. Our results confirm the existence of 3D Dirac fermions in this material with a π Berry phase. : Condens. The Shubnikov-de Hass oscillations of the magnetoresistance give nearly zero effective mass with high mobility and the nontrivial Berry phase. Jun 13, 2017 · Here we demonstrate experimentally that canted antiferromagnetic BaMnSb 2 is a 3D Weyl semimetal with a 2D electronic structure. A simple case of classical holonomy is shown in Figure 1; a particle (with a tangent vector indicated by an arrow) moves on the surface of a sphere, beginning and ending at the north pole, in such a way that Jul 31, 2018 · The Berry phase, named for Michael Berry, is a so-called geometric phase, in that the value of the phase depends on the "space" itself and the trajectory the system takes. We obtain the nontrivial π Berry phase by analysing the Shubnikov-de Haas Jun 1, 2020 · Breakdown of Ohm’s law and nontrivial Berry phase in magnetic Weyl semimetal Co3Sn2S2 June 2020 Journal of Physics: Condensed Matter 32 (40) DOI: 10. [39, 40]). blcvnkc muzvif bqf bwmmdo bcbuh vimhmxa zdmlup cxgi yrwnv mtevhmj jast vhhimv cmrplg obt vzbux