7 papers
Euler Topology in Superconducting Honeycomb Lattices
Rasoul Ghadimi, Chiranjit Mondal, Bohm-Jung Yang
Electronic bands in systems with space-time inversion (IST) symmetry can host nontrivial Euler topology. Here, we investigate the band topology of IST-symmetric superconducting hon…
Embedding independent length scale of flat bands
Seokju Lee, Seung Hun Lee, Bohm-Jung Yang
In flat-band systems with quenched kinetic energy, most of the conventional length scales related to the band dispersion become ineffectual. Although a few geometric length scales,…
Quasiperiodic pairing in graphene quasicrystals
Rasoul Ghadimi, Bohm-Jung Yang
We investigate the superconducting instabilities of twisted bilayer graphene quasicrystals (TBGQC) obtained by stacking two monolayer graphene sheets with a relative twi…
Quantum Valley Hall effect without Berry curvature
Rasoul Ghadimi, Chiranjit Mondal, Sunje Kim +1
The quantum valley Hall effect (QVHE) is characterized by the valley Chern number (VCN) in a way that one-dimensional (1D) chiral metallic states are guaranteed to appear at the do…
Revisiting the magnetic responses of bilayer graphene from the perspective of the quantum distance
Chang-geun Oh, Jun-Won Rhim, Bohm-Jung Yang
We study the influence of the quantum geometry on the magnetic responses of quadratic band crossing semimetals. More explicitly, we examine the Landau levels, quantum Hall effect,…
Non-Abelian charge conversion in bilayer binary honeycomb lattice systems
Chiranjit Mondal, Rasoul Ghadimi, Bohm-Jung Yang
In two-dimensional systems with space-time inversion symmetry, Dirac nodes (DNs) carry non-Abelian topological charges which induce intriguing momentum space braiding phenomenon. A…