Insulating state in tetralayers reveals an even-odd interaction effect in multilayer graphene

Grushina, Anya L. and Ki, Dong-Keun and Koshino, Mikito and Nicolet, Aurelien A. L. and Faugeras, Clement and McCann, Edward and Potemski, Marek and Morpurgo, Alberto F. (2015) Insulating state in tetralayers reveals an even-odd interaction effect in multilayer graphene. Nature Communications, 6. ISSN 2041-1723

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Abstract

Close to charge neutrality, the electronic properties of graphene and its multilayers are sensitive to electron-electron interactions. In bilayers, for instance, interactions are predicted to open a gap between valence and conduction bands, turning the system into an insulator. In mono and (Bernal-stacked) trilayers, which remain conducting at low temperature, interactions do not have equally drastic consequences. It is expected that interaction effects become weaker for thicker multilayers, whose behaviour should converge to that of graphite. Here we show that this expectation does not correspond to reality by revealing the occurrence of an insulating state close to charge neutrality in Bernal-stacked tetralayer graphene. The phenomenology-incompatible with the behaviour expected from the single-particle band structure-resembles that observed in bilayers, but the insulating state in tetralayers is visible at higher temperature. We explain our findings, and the systematic even-odd effect of interactions in Bernal-stacked layers of different thickness that emerges from experiments, in terms of a generalization of the interaction-driven, symmetry-broken states proposed for bilayers.

Item Type:
Journal Article
Journal or Publication Title:
Nature Communications
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Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
73870
Deposited By:
Deposited On:
18 Jun 2015 05:55
Refereed?:
Yes
Published?:
Published
Last Modified:
23 Sep 2020 02:11