Observation of Berry curvature in non-Hermitian system from far-field radiation [PDF]
Nature CommunicationsBerry curvature that describes local geometrical properties of energy bands can elucidate many fascinating phenomena in solid-state, photonic, and phononic systems, given its connection to global topological invariants such as the Chern number.
Xuefan Yin +5 more
doaj +3 more sources
Complex Berry curvature and complex energy band structures in non-Hermitian graphene model
AAPPS Bulletin, 2022 Non-Hermitian quantum systems exhibit many novel physical properties of quantum states. We consider a non-Hermtian graphene model based on the tight-binding approximation with the coupling of the graphene and the substrate.
Chao Wu, Annan Fan, Shi-Dong Liang
doaj +2 more sources
The Quantum Geometric Tensor in a Parameter-Dependent Curved Space [PDF]
Entropy, 2022 We introduce a quantum geometric tensor in a curved space with a parameter-dependent metric, which contains the quantum metric tensor as the symmetric part and the Berry curvature corresponding to the antisymmetric part.
Joan A. Austrich-Olivares +1 more
doaj +2 more sources
Quantum geometry quadrupole-induced third-order nonlinear transport in antiferromagnetic topological insulator MnBi2Te4 [PDF]
Nature CommunicationsThe study of quantum geometry effects in materials has been one of the most important research directions in recent decades. The quantum geometry of a material is characterized by the quantum geometric tensor of the Bloch states.
Hui Li +9 more
doaj +2 more sources
Thermoelectric Transport Driven by the Hilbert–Schmidt Distance [PDF]
Advanced ScienceThe geometric characteristics of Bloch wavefunctions play crucial roles in the properties of electronic transport. Within the Boltzmann equation framework, we demonstrate that the thermoelectric performance of materials is significantly influenced by the
Chang‐geun Oh +2 more
doaj +2 more sources
Third-order nonlinear Hall effect induced by the Berry-connection polarizability tensor
Nature Nanotechnology, 2021 Shen Lai, Huiying Liu, Zhaowei Zhang
exaly +2 more sources
Berry connection polarizability tensor and third-order Hall effect [PDF]
Physical review B, 2021 One big achievement in modern condensed matter physics is the recognition of the importance of various band geometric quantities in physical effects. As prominent examples, Berry curvature and the Berry curvature dipole are connected to the linear and ...
Huiying Liu +8 more
semanticscholar +1 more source
Magnetic-translational sum rule and approximate models of the molecular Berry curvature. [PDF]
Journal of Chemical Physics, 2022 The Berry connection and curvature are key components of electronic structure calculations for atoms and molecules in magnetic fields. They ensure the correct translational behavior of the effective nuclear Hamiltonian and the correct center-of-mass ...
Laurens D. M. Peters +3 more
semanticscholar +1 more source
Tracking quantum state evolution by the Berry curvature with a two-level system [PDF]
The European Physical Journal Plus, 2021 We investigate two kinds of topological structures (sphere and torus) spanned by the controlled parameters of a driven two-level system’s Hamiltonian and consider the connection between the structures and the system’s dynamics.
Zelin Zhang, Ping Xu, Zhen‐Biao Yang
semanticscholar +1 more source
Intertwined space-time symmetry, orbital magnetism, and dynamical Berry connection in a circularly shaken optical lattice [PDF]
Physical Review A, 2020 We study the circular shaking of a two dimensional optical lattice, which is essentially a (2+1) dimensional space-time lattice exhibiting periodicities in both spatial and temporal dimensions.
Hua Chen, W. Liu
semanticscholar +1 more source