Phonon-mediated room-temperature quantum Hall transport in graphene
Autor: | Daniel Vaquero, Vito Clericò, Michael Schmitz, Juan Antonio Delgado-Notario, Adrian Martín-Ramos, Juan Salvador-Sánchez, Claudius S. A. Müller, Km Rubi, Kenji Watanabe, Takashi Taniguchi, Bernd Beschoten, Christoph Stampfer, Enrique Diez, Mikhail I. Katsnelson, Uli Zeitler, Steffen Wiedmann, Sergio Pezzini |
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Rok vydání: | 2023 |
Předmět: |
Multidisciplinary
Condensed Matter - Mesoscale and Nanoscale Physics Theory of Condensed Matter Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Physics and Astronomy FOS: Physical sciences Semiconductors and Nanostructures General Chemistry Correlated Electron Systems / High Field Magnet Laboratory (HFML) General Biochemistry Genetics and Molecular Biology |
Zdroj: | Nature Communications, 14, 1, pp. 1-6 Nature Communications, 14, 1-6 |
ISSN: | 2041-1723 |
Popis: | The quantum Hall (QH) effect in two-dimensional electron systems (2DESs) is conventionally observed at liquid-helium temperatures, where lattice vibrations are strongly suppressed and bulk carrier scattering is dominated by disorder. However, due to large Landau level (LL) separation (~2000 K at B = 30 T), graphene can support the QH effect up to room temperature (RT), concomitant with a non-negligible population of acoustic phonons with a wave-vector commensurate to the inverse electronic magnetic length. Here, we demonstrate that graphene encapsulated in hexagonal boron nitride (hBN) realizes a novel transport regime, where dissipation in the QH phase is governed predominantly by electron-phonon scattering. Investigating thermally-activated transport at filling factor 2 up to RT in an ensemble of back-gated devices, we show that the high B-field behaviour correlates with their zero B-field transport mobility. By this means, we extend the well-accepted notion of phonon-limited resistivity in ultra-clean graphene to a hitherto unexplored high-field realm. 17 pages, 4 figures. Supplementary information available at https://doi.org/10.1038/s41467-023-35986-3 |
Databáze: | OpenAIRE |
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