Chiral anomaly and the novel quantum phenomena it induces have been widely studied for Dirac Weyl fermions. In most typical cases, Lorentz covariance is assumed thus linear dispersion relations are maintained. However, in realistic materials, such as semimetals, non-linear appear naturally. We develop a kinetic framework to study chiral fermions with dispersions by using methods of Wigner funct...

We explore the effects of spin-orbit coupling on nuclear wave packet motion near an out-of-equilibrium molecular junction, where nonzero Berry curvature emerges as antisymmetric part electronic friction tensor. The existence mandates that different packets (associated with spin states) experience curvatures, i.e., pseudomagnetic fields. Furthermore, for a generic, two-orbital two-lead model (re...

In transition metal dichalcogenides (TMDCs), charge carriers have spin, pseudospin, and valley degrees of freedom associated with magnetic moments. The monolayers bilayers the TMDCs, in particular, MoS2, lead to strong couplings between spin pseudospin effects. This feature has drawn attention TMDCs for their potential use advanced tech devices. Meanwhile, high-order harmonic generation (HHG) r...

Three-dimensional Hopf insulators are a class of topological phases beyond the tenfold-way classification. At critical point transition between two distinct with rotational symmetry, band-touching points Berry dipoles opposite charges overlapping in mirror-symmetric way, and carry unique curvature structures leading to special quantization flux. Close such Berry-dipole transitions, we find that...

The main result of Xiao et al. [ Phys. Rev. Lett. 95, 137204 (2005)] is shown to follow from Hamiltonian mechanics. In a recent paper on the semiclassical dynamics of a Bloch electron, Xiao, Shi and Niu [1] claim that, due to a Berry curvature term, Liouville’s theorem on the conservation of the phasespace volume element would be violated, a fact which would have been overlooked so far. Their m...