5 papers
Singular Weak-Field Thermodynamics of 2D Superconductors
Guopeng Xu, Chunli Huang
In a bulk 3D type-II superconductor, the lower critical field at which an isolated vortex becomes thermodynamically favorable is a size-independent material property. We show that…
Two-Body Solution and Instabilities along Streda Lines in Moire Flat Bands
Guopeng Xu, Chunli Huang
Moire minibands in twisted homobilayer semiconductors can, under suitable approximations, be modeled as a pair of Landau levels with opposite Chern numbers. This provides a minimal…
Localized Excitons and Landau-Level Mixing in Time-Reversal Symmetric Pairs of Chern Bands
Guopeng Xu, Nemin Wei, Inti Sodemann Villadiego +1
We study Landau-level mixing in a time-reversal-symmetric Hamiltonian composed of two sets of Landau levels with opposite magnetic field, relevant to moiré minibands in twisted hom…
Influence of the Dirac Sea on Phase Transitions in Monolayer Graphene under Strong Magnetic Fields
Guopeng Xu, Chunli Huang
Recent scanning tunneling microscopy experiments have found Kekulé-Distorted (KD) ordering in graphene subjected to strong magnetic fields, a departure from the antiferromagnetic (…
Landau-Level Mixing and SU(4) Symmetry Breaking in Graphene
Nemin Wei, Guopeng Xu, Inti Sodemann Villadiego +1
Recent scanning tunneling microscopy experiments on graphene at charge neutrality under strong magnetic fields have uncovered a ground state characterized by Kekulé distortion (KD)…