Chronological feed of everything captured from Sankar Das Sarma.
A vision-transformer neural network can predict effective spin-orbit coupling (SOC) strength and generalized Hubbard model parameters from charge stability diagrams. By training on simulated data from 2x2 Ge hole quantum dot arrays with random disorder, the model achieves high predictive fidelity even when other system parameters are unknown.
This paper investigates magnon excitations in moiré Chern ferromagnets, focusing on their influence on magnetic stability and transition temperature at integer filling factor \nu = -1. The research reveals that magnon spectra exhibit isolated low-energy bands whose topological character is tunable via interlayer displacement. A key finding is that the magnon gap's sensitive dependence on the magnetic ground state's topology leads to an order-of-magnitude enhancement of the transition temperature (Tc) in the quantum anomalous Hall phase compared to topologically trivial correlated insulators.
This paper investigates the disordered interacting edge theory of fractional topological insulators at νtot=4/3, a system composed of two time-reversal-conjugated ν=2/3 fractional quantum Hall states. It identifies conditions under which interaction-induced insulating edge states can emerge without breaking fundamental symmetries, highlighting the limitations of two-terminal transport measurements for identifying these topological insulators.
A recent STM experiment observed three distinct quantum phases in 2D bilayer graphene under a strong magnetic field. This paper argues that one of these phases, a spatially random localized phase at low filling, is consistent with the proposed disorder-dominated strongly localized amorphous "Anderson solid" phase, presenting a generic occurrence at sample-dependent filling factors.
Recent experimental observations of a "solid" phase in 2D electron systems with quenched impurities are reinterpreted. This work argues that the observed phase is an Anderson solid, where impurities cause random spatial localization of charge carriers, rather than a Wigner solid formed by interaction-induced translational symmetry breaking. The key distinction lies in the role of disorder, leading to an amorphous solid adiabatically connected to an infinite disorder Anderson fixed point.