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Article Dans Une Revue Physical Review Letters Année : 2018

Landau Velocity for Collective Quantum Hall Breakdown in Bilayer Graphene

Résumé

Breakdown of the quantum Hall effect (QHE) is commonly associated with an electric field approaching the inter Landau-level (LL) Zener field, ratio of the Landau gap and cyclotron radius. Eluded in semiconducting heterostructures, in spite of extensive investigation, the intrinsic Zener limit is reported here using high-mobility bilayer graphene and high-frequency current noise. We show that collective excitations arising from electron-electron interactions are essential. Beyond a noiseless ballistic QHE regime a large superpoissonian shot noise signals the breakdown via inter-LL scattering. The breakdown is ultimately limited by collective excitations in a regime where phonon and impurity scattering are quenched. The breakdown mechanism can be described by a Landau critical velocity as it bears strong similarities with the roton mechanism of superfluids.

Dates et versions

hal-01893577 , version 1 (11-10-2018)

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W. Yang, H. Graef, X. Lu, G. Zhang, T. Taniguchi, et al.. Landau Velocity for Collective Quantum Hall Breakdown in Bilayer Graphene. Physical Review Letters, 2018, 121 (13), pp.136804. ⟨10.1103/PhysRevLett.121.136804⟩. ⟨hal-01893577⟩
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