Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene

Sunku, S. S.; Halbertal, D.; Stauber, T.; Chen, S.; McLeod, A. S.; Rikhter, A.; Berkowitz, M. E.; Lo, C. F.  B.; Gonzalez-Acevedo, D. E.; Hone, J. C.; Dean, C. R.; Fogler, M. M.; Basov, D. N.

doi:10.1038/s41467-021-21792-2

Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene

Journal Article · Thu Mar 11 23:00:00 EST 2021 · Nature Communications

DOI:https://doi.org/10.1038/s41467-021-21792-2· OSTI ID:1816196

Sunku, S. S. ^[1]; Halbertal, D. ^[2]; Stauber, T. ^[3]; ^[2]; ^[2]; ^[4]; Berkowitz, M. E. ^[2]; Lo, C. F. B. ^[2]; Gonzalez-Acevedo, D. E. ^[2]; ^[5]; ^[2]; Fogler, M. M. ^[4]; ^[2]

Columbia Univ., New York, NY (United States). Dept. of Physics; Columbia Univ., New York, NY (United States). Dept. of Applied Physics and Applied Mathematics; OSTI
Columbia Univ., New York, NY (United States). Dept. of Physics
Instituto de Ciencia de Materiales de Madrid, CSIC, Madrid (Spain). Departamento de Teoría y Simulación de Materiales
Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Physics
Columbia Univ., New York, NY (United States). Dept. of Mechanical Engineering

Quasi-periodic moiré patterns and their effect on electronic properties of twisted bilayer graphene have been intensely studied. At small twist angle θ, due to atomic reconstruction, the moiré superlattice morphs into a network of narrow domain walls separating micron-scale AB and BA stacking regions. We use scanning probe photocurrent imaging to resolve nanoscale variations of the Seebeck coefficient occurring at these domain walls. The observed features become enhanced in a range of mid-infrared frequencies where the hexagonal boron nitride substrate is optically hyperbolic. Our results illustrate the capabilities of the nano-photocurrent technique for probing nanoscale electronic inhomogeneities in two-dimensional materials.

View Accepted Manuscript (DOE)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Simons Foundation; MINECO

Grant/Contract Number:: SC0019443

OSTI ID:: 1816196

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 12; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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