Finite Size Effects on Helical Edge States in a Quantum Spin-Hall System
Finite Size Effects on Helical Edge States in a Quantum Spin-Hall System
The hallmark of the spin-Hall insulator is the presence of gapless edge states of different spins moving in opposite directions. Through analytical solutions in a model calculation for a strip of finite width, we find that edge states on the two sides can couple together to produce a gap in …