Fingerprints of a Bosonic Symmetry-Protected Topological State in a Quantum Point Contact

Rui Xing Zhang, Chao Xing Liu

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

In this work, we study the transport through a quantum point contact for bosonic helical liquid that exists at the edge of a bilayer graphene under a strong magnetic field. We identify "smoking gun" transport signatures to distinguish a bosonic symmetry-protected topological (BSPT) state from a fermionic two-channel quantum spin Hall (QSH) state in this system. In particular, a novel charge-insulator-spin-conductor phase is found for the BSPT state, while either the charge-insulator-spin-insulator or the charge-conductor-spin-conductor phase is expected for the two-channel QSH state. Consequently, a simple transport measurement will reveal the fingerprint of bosonic topological physics in bilayer graphene systems.

Original languageEnglish (US)
Article number216803
JournalPhysical Review Letters
Volume118
Issue number21
DOIs
StatePublished - May 26 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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