Corner junction as a probe of helical edge states.
We propose and analyze interedge tunneling in a quantum spin Hall corner junction as a means to probe the helical nature of the edge states. We show that electron-electron interactions in the one-dimensional helical edge states result in Luttinger parameters for spin and charge that are intertwined, and thus rather different from those for a quantum wire with spin rotation invariance. Consequently, we find that the four-terminal conductance in a corner junction has a distinctive form that could be used as evidence for the helical nature of the edge states.
Hou
Chang-Yu
CY
Physics Department, Boston University, Boston, Massachusetts 02215, USA.
Kim
Eun-Ah
EA
Chamon
Claudio
C