Emerging edge states in the monolayer FeSe superconductor with the spin-orbital coupling
F. Miao+, T. Zhou+*
+Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,
School of Physics and Telecommunication Engineering, South China Normal University, 510006 Guangzhou, China
*Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Frontier Research Institute for Physics,
South China Normal University, 510006 Guangzhou, China
Previously, the monolayer FeSe superconductor can be described
qualitatively based on a two-orbital model.
We here proposed theoretically that the edge states and vortex induced
zero modes may emerge in the monolayer FeSe superconductor based on this
effective two-orbital model with an additional spin-orbital coupling.
However, we also verified numerically that this system is still
topologically trivial based on the calculation of the topological
invariant and the Wilson loop technique.
The edge states will disappear when the hole Fermi pockets around the
Γ point emerge upon changing the chemical potential.