Electric-field-tunable band gap in commensurate twisted bilayer graphene

Talkington, Spenser; Mele, Eugene J.

doi:10.1103/physrevb.107.l041408

Electric-field-tunable band gap in commensurate twisted bilayer graphene

Journal Article · Tue Jan 24 00:00:00 EST 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.l041408· OSTI ID:2419285

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University of Pennsylvania, Philadelphia, PA (United States); OSTI
University of Pennsylvania, Philadelphia, PA (United States)

Bernal bilayer graphene exhibits a band gap that is tunable through the infrared with an electric field. In this study, we show that sublattice odd commensurate twisted bilayer graphene (C-TBG) exhibits a band gap that is tunable through the terahertz with an electric field. We show that from the perspective of terahertz optics the sublattice odd and even forms of C-TBG are “inflated” versions of Bernal and AA-stacked bilayer graphene, respectively, with energy scales reduced by a factor of 110 for the 21.79° commensurate unit cell. This lower energy scale is accompanied by a correspondingly smaller gate voltage, which means that the strong-field regime is more easily accessible than in the Bernal case. Finally, we show that the interlayer coherence energy is a directly accessible experimental quantity through the position of a power-law divergence in the optical conductivity.

View Accepted Manuscript (DOE)

Research Organization:: University of Pennsylvania, Philadelphia, PA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: FG02-84ER45118

OSTI ID:: 2419285

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 4 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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FIG. 1(p. 3)

FIG. 2(p. 4)

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