Spontaneous layer polarization and conducting domain walls in the quantum Hall regime of bilayer graphene

Kusum Dhochak, Efrat Shimshoni, Erez Berg

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Bilayer graphene subjected to perpendicular magnetic and electric fields displays a subtle competition between different symmetry-broken phases, resulting from an interplay between the internal spin and valley degrees of freedom. The transition between different phases is often identified by an enhancement of the conductance. Here, we propose that the enhanced conductance at the transition is due to the appearance of robust conducting edge states at domain walls between the two phases. We formulate a criterion for the existence of such conducting edge states at the domain walls. For example, for a spontaneously layer polarized state at filling factor ν=2, domain walls between regions of opposite polarization carry conducting edge modes. A microscopic analysis shows that lattice-scale interactions can favor such a layer polarized state.

Original languageEnglish
Article number165107
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number16
DOIs
StatePublished - 6 Apr 2015

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society.

Fingerprint

Dive into the research topics of 'Spontaneous layer polarization and conducting domain walls in the quantum Hall regime of bilayer graphene'. Together they form a unique fingerprint.

Cite this