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Strong magnetophonon oscillations in extra-large graphene

Kumaravadivel, P.; Greenaway, M. T.; Perello, D.; Berdyugin, A.; Birkbeck, J.; Wengraf, J.; Liu, S.; Edgar, J. H.; Geim, A. K.; Eaves, L.; Krishna Kumar, R.

Authors

P. Kumaravadivel

M. T. Greenaway

D. Perello

A. Berdyugin

J. Birkbeck

J. Wengraf

S. Liu

J. H. Edgar

A. K. Geim

L. Eaves

R. Krishna Kumar



Abstract

Van der Waals materials and their heterostructures offer a versatile platform for studying a variety of quantum transport phenomena due to their unique crystalline properties and the exceptional ability in tuning their electronic spectrum. However, most experiments are limited to devices that have lateral dimensions of only a few micrometres. Here, we perform magnetotransport measurements on graphene/hexagonal boron-nitride Hall bars and show that wider devices reveal additional quantum effects. In devices wider than ten micrometres we observe distinct magnetoresistance oscillations that are caused by resonant scattering of Landau-quantised Dirac electrons by acoustic phonons in graphene. The study allows us to accurately determine graphene’s low energy phonon dispersion curves and shows that transverse acoustic modes cause most of phonon scattering. Our work highlights the crucial importance of device width when probing quantum effects and also demonstrates a precise, spectroscopic method for studying electron-phonon interactions in van der Waals heterostructures.

Journal Article Type Article
Publication Date 2019-12
Journal Nature Communications
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 10
Issue 1
Article Number 3334
APA6 Citation Kumaravadivel, P., Greenaway, M. T., Perello, D., Berdyugin, A., Birkbeck, J., Wengraf, J., …Krishna Kumar, R. (2019). Strong magnetophonon oscillations in extra-large graphene. Nature Communications, 10(1), https://doi.org/10.1038/s41467-019-11379-3
DOI https://doi.org/10.1038/s41467-019-11379-3
Keywords General biochemistry, Genetics and molecular biology; General physics and astronomy; General chemistry
Publisher URL https://www.nature.com/articles/s41467-019-11379-3

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