The Berry phase plays an important role in determining many physical properties of
quantum systems. However, tuning the energy spectrum of a quantum system via Berry …

Graphene quantum dots (GQDs) can exhibit a range of spectacular phenomena such as the
Klein tunneling induced quasibound states and Berry phase tuned energy spectra …

Intervalley scattering involves microscopic processes that electrons are scattered by atomic-
scale defects on the nanoscale. Although central to our understanding of electronic …

Introducing quantum confinement has uncovered a rich set of interesting quantum
phenomena and allows one to directly probe the physics of confined (quasi-) particles. In …

It has long been an ultimate goal to introduce chemical doping at the atomic level to
precisely tune properties of materials. Two-dimensional materials have a natural advantage …

Impurities exist inevitably in two-dimensional materials as they spontaneously adsorb onto
the surface during fabrication, usually exerting detrimental effects on electronic transport …

Two-dimensional (2D) moiré systems based on twisted bilayer graphene and transition
metal dichalcogenides provide a promising platform to investigate emergent phenomena …

It has long been an ultimate goal to introduce chemical doping at the atomic level to
precisely tune properties of materials. Two-dimensional materials have natural advantage …

We show that the chiral modes in circular graphene pn junctions provide an advantage for
spin manipulation via spin-orbit coupling compared to semiconductor platforms. We derive …

The surface states of topological insulators are characterized by spin-momentum locking,
where the electron spin is locked perpendicular to its momentum. This property is preserved …