TY - JOUR
TI - Topological superconductivity in a two-dimensional Weyl SSH model
AU - Rosenberg, P.
AU - Manousakis, E.
JO - Physical Review B
PY - 2022
VL - 106
TODO - 5
SP - null
PB - American Physical Society
SN - 2469-9950, 2469-9969
TODO - 10.1103/PhysRevB.106.054511
TODO - Gap functions;  Hubbard interaction;  Majorana;  Pairing interactions;  Spinless fermion;  Su Schrieffer Heeger model;  Sub-lattices;  Superconducting state;  Two-dimensional;  Unit cells, Topology
TODO - We study the emergence of topological superconductivity in a two-dimensional Weyl system, composed of stacked Su-Schrieffer-Heeger (SSH) chains. A previous analysis of the model showed that the addition of an attractive Hubbard interaction between spinful electrons leads to a superconducting state that has an intricate pairing structure, but is topologically trivial. Here we consider a pairing interaction that couples spinless fermions on opposite sublattices within the same unit cell. We observe that this physically motivated, momentum-independent pairing interaction induces a topological superconducting state, characterized by a gap function with a nontrivial phase, as well as Majorana and Fermi arc edge states along the edge perpendicular to the direction of the SSH dimerization. In addition, we observe a transition as a function of pairing interaction strength and chemical potential, indicated by a change in the sign of the topological charge carried by each of the four Bogoliubov-Weyl nodes. © 2022 American Physical Society.
ER -