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Disorder-Induced Phase Transitions in Three-Dimensional Chiral Second-Order Topological Insulator
Yedi Shen, Zeyu Li, Qian Niu +1
Topological insulators have been extended to higher-order versions that possess topological hinge or corner states in lower dimensions. However, their robustness against disorder i…
Berry-Curvature Engineering for Nonreciprocal Directional Dichroism in Two-Dimensional Antiferromagnets
Wenhao Liang, Junjie Zeng, Zhenhua Qiao +2
In two-dimensional antiferromagnets, we identify the mixed Berry curvature as the geometrical origin of the nonreciprocal directional dichroism (NDD), which refers to the differenc…
Time-Reversal-Even Nonlinear Current Induced Spin Polarization
Cong Xiao, Weikang Wu, Hui Wang +6
We propose a time-reversal-even spin generation in second order of electric fields, which dominates the current induced spin polarization in a wide class of centrosymmetric nonmagn…
Semiclassical dynamics of electrons in space-time crystal: Magnetization, polarization, and current response
Qiang Gao, Qian Niu
A space-time crystal is defined as a quantum mechanical system with both spatial and temporal periodicity. Such a system can be described by the Floquet-Bloch (FB) theory. We first…
Large Rashba Spin-Orbit Coupling and High-Temperature Quantum Anomalous Hall Effect in Re-Intercalated Graphene/CrI Heterostructure
Yulei Han, Zhi Yan, Zeyu Li +4
In 2010, quantum anomalous Hall effect (QAHE) in graphene was proposed in the presence of Rashba spin-orbit coupling and ferromagnetic exchange field. After a decade's experimental…
Electric Field Influenced Coordinate Jump of the Guiding Center and Magnetotransport
Jingjing Feng, Yang Gao, Qian Niu
We derived an electrical current formula in the presence of a strong out of plane magnetic field and an in plane electric field, and within two dimensional disordered systems. This…
Second-Order Topological Insulator in van der Waals Heterostructures of CoBr/PtHgSe/CoBr
Zheng Liu, Yafei Ren, Yulei Han +2
Second-order topological insulator, which has (d-2)-dimensional topological hinge or corner states, has been observed in three-dimensional materials, but has yet not been observed…
Intrinsic Nonlinear Spin Magnetoelectricity in Centrosymmetric Magnets
Cong Xiao, Huiying Liu, Weikang Wu +3
We propose an intrinsic nonlinear spin magnetoelectric effect in magnetic materials, offering the potential of all-electric control of spin degree of freedom in centrosymmetric mag…
DC Current Generation and Power Feature in Strongly Driven Floquet-Bloch Systems
Qiang Gao, Yafei Ren, Qian Niu
We study the DC current generation in a periodically driven Bloch system connected to a heat bath. Under a relaxation time approximation, the density matrix for such a system is ob…
Lattice dynamics with molecular Berry curvature: chiral optical phonons
Daniyar Saparov, Bangguo Xiong, Yafei Ren +1
Under the Born-Oppenheimer approximation, the electronic ground state evolves adiabatically and can accumulate geometrical phases characterized by the molecular Berry curvature. In…
Semiclassical equations of motion for disordered conductors: extrinsic interband velocity, corrected collision integral and spin-orbit torques
Rhonald Burgos Atencia, Qian Niu, Dimitrie Culcer
The semiclassical equations of motion are widely used to describe carrier transport in conducting materials. Nevertheless, the substantial challenge of incorporating disorder syste…
Giant -axis nonlinear anomalous Hall effect in T-MoTe and WTe
Archana Tiwari, Fangchu Chen, Shazhou Zhong +11
While the anomalous Hall effect can manifest even without an external magnetic field, time reversal symmetry is nonetheless still broken by the internal magnetization of the sample…
Phonon Magnetic Moment from Electronic Topological Magnetization
Yafei Ren, Cong Xiao, Daniyar Saparov +1
The traditional theory of magnetic moments for chiral phonons is based on the picture of the circular motion of the Born effective charge, typically yielding a small fractional val…
Topological electric driving of magnetization dynamics in insulators
Cong Xiao, Bangguo Xiong, Qian Niu
Established forms of electromagnetic coupling are usually conservative (in insulators) or dissipative (in metals and semiconductors). Here we point out the possibility of nondissip…
Conserved current of nonconserved quantities
Cong Xiao, Qian Niu
We provide a unified semiclassical theory for the conserved current of nonconserved quantities, and manifest it in two physical contexts: the spin current of Bloch electrons and th…
WKB estimate of bilayer graphene's magic twist angles
Yafei Ren, Qiang Gao, A. H. MacDonald +1
Graphene bilayers exhibit zero-energy flat bands at a discrete series of magic twist angles. In the absence of intra-sublattice inter-layer hopping, zero-energy states satisfy a Di…
Unified bulk semiclassical theory for intrinsic thermal transport and magnetization currents
Cong Xiao, Qian Niu
We reveal the unexpected role of the material inhomogeneity in unifying the formulation of intrinsic thermal and thermoelectric transport as well as magnetization currents. The smo…
Engineering Corner States from Two-Dimensional Topological Insulators
Yafei Ren, Zhenhua Qiao, Qian Niu
We theoretically demonstrate that the second-order topological insulator with robust corner states can be realized in two-dimensional topological insulators by apply…
Thermoelectric Generation of Orbital Magnetization in Metals
Cong Xiao, Huiying Liu, Jianzhou Zhao +2
We propose an orbital magnetothermal effect wherein a temperature gradient generates an orbital magnetization (OM) for Bloch electrons, and we present a unified theory for electric…
Theory of nonlinear Hall effects: renewed semiclassics from quantum kinetics
Cong Xiao, Z. Z. Du, Qian Niu
We propose a modified Boltzmann nonlinear electric-transport framework which differs from the nonlinear generalization of the linear Boltzmann formalism by a contribution that has…
Theory of phonon side jump contribution in Anomalous Hall transport
Cong Xiao, Ying Liu, Ming Xie +2
The role of electron-phonon scattering in finite-temperature anomalous Hall effect is still poorly understood. In this work, we present a Boltzmann theory for the side-jump contrib…
Scaling parameters in anomalous and nonlinear Hall effects depend on temperature
Cong Xiao, Hailong Zhou, Qian Niu
In the study of the anomalous Hall effect, the scaling relations between the anomalous Hall and longitudinal resistivities play the central role. The scaling parameters by definiti…
Berry-phase effects in dipole density and Mott relation
Liang Dong, Cong Xiao, Bangguo Xiong +1
We provide a unified semiclassical theory for thermoelectric responses of any observable represented by an operator that is well-defined in periodic crystals.…
Temperature dependence of side-jump spin Hall conductivity
Cong Xiao, Yi Liu, Zhe Yuan +2
In the conventional paradigm of the spin Hall effect, the side-jump conductivity due to electron-phonon scattering is regarded to be temperature independent. To the contrary, we dr…