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Interaction-Driven Topological Switch in a -Band Honeycomb Lattice
Hua Chen, X. C. Xie
The non-interacting band structure of spinless fermions in a two-dimensional () -band honeycomb lattice exhibits two quadratic band touching points (QBTPs), which lie at th…
Emergent flat band lattices in spatially periodic magnetic fields
M. Tahir, Olivier Pinaud, Hua Chen
Motivated by the recent discovery of Mott insulating phase and unconventional superconductivity due to the flat bands in twisted bilayer graphene, we propose more generic ways of g…
Crystalline Splitting of Orbitals in Regular Optical Lattices
Hua Chen, X. C. Xie
In solids, crystal field splitting refers to the lifting of atomic orbital degeneracy by the surrounding ions through the static electric field. Similarly, we show that the degener…
Spin Hall effects without spin currents in magnetic insulators
Hua Chen, Qian Niu, Allan H. MacDonald
The spin Hall effect (SHE) is normally discussed in terms of a spin current, which is ill-defined in strongly spin-orbit-coupled systems because of spin non-conservation. In this w…
Manipulating Anomalous Hall Antiferromagnets with Magnetic Fields
Hua Chen, Tzu-Cheng Wang, Di Xiao +3
The symmetry considerations that imply a non-zero anomalous Hall effect (AHE) in certain non-collinear antiferromagnets also imply both non-zero orbital magnetization and a net spi…
Ultrathin Films of Superconducting Metals as a Platform for Topological Superconductivity
Chao Lei, Hua Chen, Allan H. MacDonald
The ingredients normally required to achieve topological superconductivity (TSC) are Cooper pairing, broken inversion symmetry, and broken time-reversal symmetry. We present a theo…