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_name
Nat Communjournal_title
Nature communicationsauthors
Kumaravadivel P,Greenaway MT,Perello D,Berdyugin A,Birkbeck J,Wengraf J,Liu S,Edgar JH,Geim AK,Eaves L,Krishna Kumar Rdoi
10.1038/s41467-019-11379-3subject
Has Abstractpub_date
2019-07-26 00:00:00pages
3334issue
1issn
2041-1723pii
10.1038/s41467-019-11379-3journal_volume
10pub_type
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