Nano-photocurrent Mapping of Local Electronic Structure in Twisted Bilayer Graphene

Sunku, Sai S.; McLeod, Alexander S.; Stauber, Tobias; Yoo, Hyobin; Halbertal, Dorri; Ni, Guangxin; Sternbach, Aaron; Jiang, Bor-Yuan; Taniguchi, Takashi; Watanabe, Kenji; Kim, Philip; Fogler, Michael M.; Basov, D. N.

doi:10.1021/acs.nanolett.9b04637

Nano-photocurrent Mapping of Local Electronic Structure in Twisted Bilayer Graphene

Journal Article · Wed Feb 12 23:00:00 EST 2020 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.9b04637· OSTI ID:1803424

^[1]; McLeod, Alexander S. ^[2]; ^[3]; Yoo, Hyobin ^[4]; ^[2]; ^[2]; Sternbach, Aaron ^[2]; ^[5]; ^[6]; ^[6]; Kim, Philip ^[4]; Fogler, Michael M. ^[5]; Basov, D. N. ^[2]

Columbia Univ., New York, NY (United States); OSTI
Columbia Univ., New York, NY (United States)
Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain); Instituto de Ciencia de Materiales de Madrid
Harvard Univ., Cambridge, MA (United States)
Univ. of California San Diego, La Jolla, CA (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)

In this work, we report a combined nano-photocurrent and infrared nanoscopy study of twisted bilayer graphene (TBG) enabling access to the local electronic phenomena at length scales as short as 20 nm. We show that the photocurrent changes sign at carrier densities tracking the local superlattice density of states of TBG. We use this property to identify domains of varying local twist angle by local photothermoelectric effect. Consistent with the photocurrent study, infrared nanoimaging experiments reveal optical conductivity features dominated by twist-angle-dependent interband transitions. Our results provide a fast and robust method for mapping the electronic structure of TBG and suggest that similar methods can be broadly applied to probe electronic inhomogeneities of Moiré superlattices in other van der Waals heterostructures.

View Accepted Manuscript (DOE)

Research Organization:: Columbia Univ., New York, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC); US Office of Naval Research (ONR); US Air Force Office of Scientific Research (AFOSR); MINECO

Grant/Contract Number:: SC0018426

OSTI ID:: 1803424

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 5 Vol. 20; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Nano-photocurrent Mapping of Local Electronic Structure in Twisted Bilayer Graphene

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