Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene

S. S. Sunku, D. Halbertal (), T. Stauber, Song Chen, A. S. McLeod, A. Rikhter, M. E. Berkowitz, C. F. B. Lo, D. E. Gonzalez-Acevedo, J. C. Hone, C. R. Dean, M. M. Fogler and D. N. Basov
Additional contact information
S. S. Sunku: Columbia University
D. Halbertal: Columbia University
T. Stauber: Departamento de Teoría y Simulación de Materiales, Instituto de Ciencia de Materiales de Madrid, CSIC
A. S. McLeod: Columbia University
A. Rikhter: University of California, San Diego
M. E. Berkowitz: Columbia University
C. F. B. Lo: Columbia University
D. E. Gonzalez-Acevedo: Columbia University
J. C. Hone: Columbia University
C. R. Dean: Columbia University
M. M. Fogler: University of California, San Diego
D. N. Basov: Columbia University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-21792-2

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