Article Extreme electron–hole drag and negative mobility in the Dirac plasma of graphene

Leonid A. Ponomarenko ORCID ; Alessandro Principi ; Andy D. Niblett ; Wendong Wang ORCID ; Roman V. Gorbachev ORCID ; Piranavan Kumaravadivel ORCID ; Alexey I. Berdyugin ; Alexey V. Ermakov ORCID ; Sergey Slizovskiy ORCID ; Kenji Watanabe SAMURAI ORCID ; Takashi Taniguchi SAMURAI ORCID ; Qi Ge ; Vladimir I. Fal’ko ORCID ; Laurence Eaves ORCID ; Mark T. Greenaway ORCID ; Andre K. Geim ORCID

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Leonid A. Ponomarenko, Alessandro Principi, Andy D. Niblett, Wendong Wang, Roman V. Gorbachev, Piranavan Kumaravadivel, Alexey I. Berdyugin, Alexey V. Ermakov, Sergey Slizovskiy, Kenji Watanabe, Takashi Taniguchi, Qi Ge, Vladimir I. Fal’ko, Laurence Eaves, Mark T. Greenaway, Andre K. Geim. Extreme electron–hole drag and negative mobility in the Dirac plasma of graphene. Nature Communications. 2024, 15 (1), 9869. https://doi.org/10.1038/s41467-024-54198-x

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(abstract)

Coulomb drag between adjacent electron and hole gases has attracted considerable attention, being studied in various two–dimensional systems, including semiconductor and graphene heterostructures. Here we report measurements of electron–hole drag in the Planckian plasma that develops in monolayer graphene in the vicinity of its Dirac point above liquid–nitrogen temperatures. The frequent electron–hole scattering forces minority carriers to move against the applied electric field due to the drag induced by majority carriers. This unidirectional transport of electrons and holes results in nominally negative mobility for the minority carriers. The electron–hole drag is found to be strongest near room temperature, despite being notably affected by phonon scattering. Our findings provide better understanding of the transport properties of charge–neutral graphene, reveal limits on its hydrodynamic description and also offer insight into quantum–critical systems in general.

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Keyword: Coulomb drag, Planckian plasma, graphene

Date published: 2024-11-14

Publisher: Springer Science and Business Media LLC

Journal:

  • Nature Communications (ISSN: 20411723) vol. 15 issue. 1 9869

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Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1038/s41467-024-54198-x

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Updated at: 2025-02-05 16:30:16 +0900

Published on MDR: 2025-02-05 16:30:16 +0900

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