Quantum Hall Response to Time-Dependent Strain Gradients in Graphene

Eran Sela, Yakov Bloch, Felix Von Oppen, Moshe Ben Shalom

Research output: Contribution to journalArticlepeer-review

Abstract

Mechanical deformations of graphene induce a term in the Dirac Hamiltonian that is reminiscent of an electromagnetic vector potential. Strain gradients along particular lattice directions induce local pseudomagnetic fields and substantial energy gaps as indeed observed experimentally. Expanding this analogy, we propose to complement the pseudomagnetic field by a pseudoelectric field, generated by a time-dependent oscillating stress applied to a graphene ribbon. The joint Hall-like response to these crossed fields results in a strain-induced charge current along the ribbon. We analyze in detail a particular experimental implementation in the (pseudo)quantum Hall regime with weak intervalley scattering. This allows us to predict an (approximately) quantized Hall current that is unaffected by screening due to diffusion currents.

Original languageEnglish
Article number026602
JournalPhysical Review Letters
Volume124
Issue number2
DOIs
StatePublished - 16 Jan 2020

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