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Gapped bilayer Graphene: a tunable strongly correlated band insulator

Research output: Contribution to journalJournal article

Published
Article number106801
<mark>Journal publication date</mark>7/09/2012
<mark>Journal</mark>Physical Review Letters
Issue number10
Volume109
Number of pages5
<mark>State</mark>Published
Early online date7/09/12
<mark>Original language</mark>English

Abstract

We introduce the notion of the strongly correlated band insulator (SCI), where the lowest energy excitations are collective modes (excitons) rather than the single particles. We construct controllable 1/N expansion for SCI to describe their observable properties. A remarkable example of the SCI is bilayer graphene which is shown to be tunable between the SCI and usual weak coupling regime.

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©2012 American Physical Society