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 …

Q uantum ESPRESSO is an integrated suite of open-source computer codes for quantum
simulations of materials using state-of-the-art electronic-structure techniques, based on …

Quantum geometric properties of Bloch wave functions in solids, that is, Berry curvature and
the quantum metric, are known to significantly influence the ground-and excited-state …

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” …

We investigate physical properties that can be used to distinguish the valley degree of
freedom in systems where inversion symmetry is broken, using graphene systems as …

The accuracy and efficiency of electronic-structure methods to understand, predict and
design the properties of materials has driven a new paradigm in research. Simulations can …

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 …

In solids, electronic Bloch states are formed by atomic orbitals. While it is natural to expect
that orbital composition and information about Bloch states can be manipulated and …

Response of electronic systems in intense lights (ac electric fields) to dc source-drain fields
is formulated with the Floquet method. We have then applied the formalism to graphene, for …