The quantum Hall (QH) effect, quantized Hall resistance combined with zero longitudinal
resistance, is the characteristic experimental fingerprint of Chern insulators—topologically …

Ever since its discovery the notion of Berry phase has permeated through all branches of
physics. Over the past three decades it was gradually realized that the Berry phase of the …

The electronic ground state of a periodic system is usually described in terms of extended
Bloch orbitals, but an alternative representation in terms of localized “Wannier functions” …

A monolayer of a transition metal dichalcogenide such as WSe2 is a two-dimensional direct-
bandgap valley-semiconductor, having an effective honeycomb lattice structure with broken …

First-principles calculations of NMR parameters in solids (including the chemical shift, the
quadrupolar interaction for nuclei with spin quantum number I> 1/2, and the indirect J …

The generation of spin and orbital currents is of crucial importance in the field of spin-
orbitronics. In this work, using relativistic density functional theory and the Kubo linear …

We present a theory of the thermal Hall effect in insulating quantum magnets, where the heat
current is totally carried by charge-neutral objects such as magnons and spinons. Two …

We study the electronic structures and topological properties of (M+ N)-layer twisted
graphene systems. We consider the generic situation that N-layer graphene is placed on top …

This paper presents a mathematical and numerical analysis of the flat-band wave functions
occurring in the chiral model of twisted bilayer graphene at the “magic” twist angles. We …

Moiré graphene systems have attracted considerable attention in the past 3 years because
they exhibit exotic phenomena including correlated insulating states, unconventional …