期刊
NATURE COMMUNICATIONS
卷 10, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-11379-3
关键词
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资金
- Engineering and Physical Sciences Research Council (EPSRC)
- Graphene Flagship
- Royal Society
- Lloyd's Register Foundation
- Materials Engineering and Processing program of the National Science Foundation [CMMI 1538127]
- II-VI Foundation
- Engineering and Physical Research Council (EPSRC) doctoral-prize fellowship award
- Graphene NowNANO Doctoral Training Centre
- EPSRC [EP/K005014/1] Funding Source: UKRI
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.
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