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  • Open Access

Pseudospin modulation in coupled graphene systems

Chen-Di Han1, Hong-Ya Xu1, and Ying-Cheng Lai1,2,*

  • 1School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, Arizona 85287, USA
  • 2Department of Physics, Arizona State University, Tempe, Arizona 85287, USA

  • *Ying-Cheng.Lai@asu.edu
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Phys. Rev. Research 2, 033406 – Published 14 September, 2020

DOI: https://doi.org/10.1103/PhysRevResearch.2.033406

Abstract

The ability to manipulate pseudospin can find applications in Dirac-material based spintronics. Unlike the transport of real spin that can be modulated by a magnetic field, some form of magnetization, or a spin-transfer torque, pseudospin does not respond to a magnetic field, making modulating pseudospin transport a challenging task. We articulate an asymmetrically coupled cavity-waveguide configuration in graphene and uncover a phenomenon: making the classical dynamics of the cavity deformed can effectively modulate and enhance pseudospin polarization in the waveguide. The underlying mechanism of this remarkable phenomenon can be attributed to chaos-assisted tunneling, which has been well documented in nonrelativistic quantum systems but not yet in Dirac material systems. The finding establishes the feasibility to develop pseudospin modulators for graphene systems through externally applied electrical potential only, with fidelity over 10% at the effective distance of several cavity sizes along the waveguide.

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Phys. Rev. Research 2, 033406– Published 14 September, 2020
  • Received 4 May 2020
  • Revised 5 August 2020
  • Accepted 10 August 2020
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