Interacting valley Chern insulator and its topological imprint on moiré superconductors
Xiao-Chuan Wu, Yichen Xu, Chao-Ming Jian, Cenke Xu
DOI 10.1103/PhysRevB.100.155138 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
One salient feature of systems with moiré superlattice is that the Chern number of “minibands” originating from each valley of the original graphene Brillouin zone becomes a well-defined quantized number because the miniband from each valley can be isolated from the rest of the spectrum due to the moiré potential. Then a moiré system with a well-defined valley Chern number can become a nonchiral topological insulator with U(1)×Z3 symmetry and a Z classification at the free fermion level. Here we demonstrate that the strongly interacting nature of the moiré system reduces the classification of the valley Chern insulator from Z to Z3, and it is topologically equivalent to a bosonic symmetry-protected topological state made of local boson operators. We also demonstrate that even if the system becomes a superconductor when doped away from the valley Chern insulator, the valley Chern insulator still leaves a topological imprint as the localized Majorana fermion zero mode in certain geometric configuration.
Similar papers
Generic Weyl phase in the vortex state of quasi-two-dimensional chiral superconductors
similarity 0.89Tomohiro Yoshida & Masafumi Udagawa
Source status unknown — claims are unverified
Local Kekulé distortion turns twisted bilayer graphene into topological Mott insulators and superconductors
similarity 0.88Andrea Blason & Michele Fabrizio
Source status unknown — claims are unverified
Superconductivity in mutual Chern-Simons gauge theory
similarity 0.88Peng Ye et al.
Source status unknown — claims are unverified
Intertwined magnetism and superconductivity in isolated correlated flat bands
similarity 0.88Xuepeng Wang et al.
Source status unknown — claims are unverified
Multiple Majorana edge modes in magnetic topological insulator–superconductor heterostructures
similarity 0.88Qingming Li et al.
Source status unknown — claims are unverified
Topological properties of finite-size heterostructures of magnetic topological insulators and superconductors
similarity 0.88Julian Legendre et al.
Source status unknown — claims are unverified