Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene

S. S. Sunku; D. Halbertal; T. Stauber; S. 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; D. N. Basov

doi:10.1038/s41467-021-21792-2

Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene

S. S. Sunku, D. Halbertal, T. Stauber, S. 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, D. N. Basov

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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.

Original language	English (US)
Article number	1641
Journal	Nature communications
Volume	12
Issue number	1
DOIs	https://doi.org/10.1038/s41467-021-21792-2
State	Published - Dec 1 2021
Externally published	Yes

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© 2021, The Author(s).

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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. (2021). Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene. Nature communications, 12(1), Article 1641. https://doi.org/10.1038/s41467-021-21792-2

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abstract = "Quasi-periodic moir{\'e} 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 moir{\'e} 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.",

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AU - Stauber, T.

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AU - McLeod, A. S.

AU - Rikhter, A.

AU - Berkowitz, M. E.

AU - Lo, C. F.B.

AU - Gonzalez-Acevedo, D. E.

AU - Hone, J. C.

AU - Dean, C. R.

AU - Fogler, M. M.

AU - Basov, D. N.

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AB - 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.

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Hyperbolic enhancement of photocurrent patterns in minimally twisted bilayer graphene

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