• 文献标题:   Quantum Hall Response to Time-Dependent Strain Gradients in Graphene
  • 文献类型:   Article
  • 作  者:   SELA E, BLOCH Y, VON OPPEN F, BEN SHALOM M
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007 EI 1079-7114
  • 通讯作者地址:   Tel Aviv Univ
  • 被引频次:   2
  • DOI:   10.1103/PhysRevLett.124.026602
  • 出版年:   2020

▎ 摘  要

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.