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Superfluid-insulator transition of quantum Hall domain walls in bilayer graphene

Mazo, V., Huang, C.W., Shimshoni, E., Carr, S.T., Fertig, H.A. (2014) Superfluid-insulator transition of quantum Hall domain walls in bilayer graphene. Physical Review B - Condensed Matter and Materials Physics, 89 (12). pp. 121411-121416. ISSN 1098-0121. (doi:10.1103/PhysRevB.89.121411) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://www.dx.doi.org/10.1103/PhysRevB.89.121411

Abstract

We consider the ν=0 quantum Hall ferromagnetic state of bilayer graphene subject to a kinklike perpendicular electric field, which generates domain walls in the electronic state and low-energy collective modes confined to move along them. In particular, it is shown that two pairs of collective helical modes are formed at opposite sides of the kink, each pair consisting of modes with identical helicities. We derive an effective field-theoretical model of these modes in terms of two weakly coupled anisotropic quantum spin ladders, with parameters tunable through control of the electric and magnetic fields. This yields a rich phase diagram, where, due to the helical nature of the modes, distinct phases possess very different charge conduction properties. Most notably, this system can potentially exhibit a transition from a superfluid to an insulating phase.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.89.121411
Uncontrolled keywords: Physics of Quantum Materials
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Sam Carr
Date Deposited: 22 Jul 2015 08:13 UTC
Last Modified: 01 Aug 2019 10:39 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49622 (The current URI for this page, for reference purposes)
Carr, S.T.: https://orcid.org/0000-0001-9995-4944
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