AA -stacked bilayer graphene in an applied electric field: Tunable antiferromagnetism and coexisting exciton order parameter

R. S. Akzyanov, A. O. Sboychakov, A. V. Rozhkov, A. L. Rakhmanov, Franco Nori

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

We study the electronic properties of AA-stacked bilayer graphene in a transverse electric field. The strong on-site Coulomb repulsion stabilizes the antiferromagnetic order in such a system. The antiferromagnetic order is suppressed by the transverse bias voltage, at least partially. The interplane Coulomb repulsion and nonzero voltage stabilize an exciton order parameter. The exciton order parameter coexists with the antiferromagnetism and can be as large as several tens of meV for realistic values of the bias voltage and interaction constants. The application of a transverse bias voltage can be used to control the transport properties of the bilayer.

Original languageEnglish
Article number155415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number15
DOIs
Publication statusPublished - 9 Oct 2014
Externally publishedYes

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