Cooling of chiral heat transport in the quantum Hall effect regime of graphene

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    In the quantum Hall effect (QHE) regime, heat is carried by electrons in the edge states of Landau levels. Here, we study cooling of hot electrons propagating along the edge of graphene at the filling factor = 2, mediated by acoustic phonons. We determine the temperature profile extended from a hot spot, where the Hall current is injected into graphene from a metallic contact, taking into
    account specifics of boundary conditions for lattice displacements in graphene in a van der Waals heterostructure with an insulating substrate. Our calculations, performed using generic boundary conditions for Dirac electrons, show that emission of phonons can explain a short cooling length observed in graphene-based QHE devices by Nahm, Hwang and Lee [PRL 110, 226801 (2013)].
    Original languageEnglish
    JournalPhysical Review B
    Publication statusPublished - 28 Aug 2017

    Research Beacons, Institutes and Platforms

    • National Graphene Institute


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