Corner junction as a probe of helical edge states

Chang Yu Hou, Eun Ah Kim, Claudio Chamon

Research output: Contribution to journalArticlepeer-review

117 Scopus citations

Abstract

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.

Original languageEnglish
Article number076602
JournalPhysical Review Letters
Volume102
Issue number7
DOIs
StatePublished - 17 Feb 2009

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