Superconductivity has been observed in moiré systems such as twisted bilayer graphene,
which host flat, dispersionless electronic bands. In parallel, theory work has discovered that …

The past decade has witnessed dramatic progress related to various aspects of emergent
topological polar textures in oxide nanostructures displaying vortices, skyrmions, merons …

We show that moiré bands of twisted homobilayers can be topologically nontrivial, and
illustrate the tendency by studying valence band states in±K valleys of twisted bilayer …

We introduce a new cosmological diagnostic pair {r, s} called the Statefinder. The Statefinder
is a geometrical diagnostic and allows us to characterize the properties of dark energy in a …

The basic aspects of electrons in graphene (two-dimensional graphite) exposed to a strong
perpendicular magnetic field are reviewed. One of its most salient features is the relativistic …

Topological phases with insulating bulk and gapless surface or edge modes have attracted
intensive attention because of their fundamental physics implications and potential …

An exciton is the particle-like entity that forms when an electron is bound to a positively
charged 'hole'. An ordered electronic state in which excitons condense into a single …

Topological solitons, a class of stable nonlinear excitations, appear in diverse domains as in
the Skyrme model of nuclear forces. Here, we argue that similar excitations play an …

We study magic angle graphene in the presence of both strain and particle-hole symmetry
breaking due to nonlocal interlayer tunneling. We perform a self-consistent Hartree-Fock …

We present a microscopic theory for collective excitations of quantum anomalous Hall
ferromagnets (QAHF) in twisted bilayer graphene. We calculate the spin magnon and valley …