In-Plane Electric Polarization of Bilayer Graphene Nanoribbons Induced by an Interlayer Bias Voltage

Ryo Okugawa, Junya Tanaka, Takashi Koretsune, Susumu Saito, Shuichi Murakami

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We theoretically show that an interlayer bias voltage in the AB-stacked bilayer graphene nanoribbons with armchair edges induces an electric polarization along the ribbon. Both tight-binding and ab initio calculations consistently indicate that when the bias voltage is weak, the polarization shows opposite signs depending on the ribbon width modulo three. This nontrivial dependence is explained using a two-band effective model. A strong limit of the bias voltage in the tight-binding model shows either one-third or zero polarization, which agrees with the topological argument.

Original languageEnglish
Article number156601
JournalPhysical Review Letters
Volume115
Issue number15
DOIs
Publication statusPublished - 2015 Oct 5
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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