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Strong magnetophonon oscillations in extra-large graphene

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posted on 06.08.2019, 09:57 by P Kumaravadivel, Mark GreenawayMark Greenaway, D Perello, A Berdyugin, J Birkbeck, J Wengraf, S Liu, JH Edgar, AK Geim, L Eaves, R Krishna Kumar
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.

Funding

Engineering and Physical Sciences Research Council (EPSRC), Graphene Flagship, the Royal Society and Lloyd’s Register Foundation

Materials Engineering and Processing program of the National Science Foundation under the award number CMMI 1538127

History

School

  • Science

Department

  • Physics

Published in

Nature Communications

Volume

10

Issue

1

Pages

3334

Publisher

Springer Science and Business Media LLC

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Springer under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

02/07/2019

Publication date

2019/07/26

Copyright date

2019

eISSN

2041-1723

Language

en

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