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Full electric-field tuning of the nonreciprocal transport effect in massive chiral fermions with trigonal warping

Elisha Cho-Hao Lu, Cheng-Tung Cheng, Liang Li, and Wei-Li Lee*

  • Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan, Republic of China

  • *wlee@phys.sinica.edu.tw
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Phys. Rev. Research 3, 033160 – Published 16 August, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.033160

Abstract

In a noncentrosymmetric system, an intrinsic electric polarization is allowed and may lead to unusual nonreciprocal charge transport phenomena. As a result, a current-dependent resistance, arising from the magnetoelectric anisotropy term of k·E⃗×B⃗, appears and acts as a current rectifier with the amount of rectification being linearly proportional to the magnitude of both current and applied magnetic field. In this work, a different type of nonreciprocal transport effect was demonstrated in a graphene-based device, which requires no external magnetic field. Due to the unique pseudospin (valley) degree of freedom in chiral fermions with trigonal warping, a large nonreciprocal transport effect was uncovered in a gapped bilayer graphene, where electric-field tunabilities of the band gap and valley polarization play an important role. The exact cancellation of nonreciprocal effect between two different valleys is effectively removed by breaking the inversion symmetry via electric gatings. The magnitude of the current rectification appears to be at a maximum when the Fermi surface undergoes a Lifshitz transition near the band edges, which is proportional to the current and the displacement field strength. The full electric-field tuning of the nonreciprocal transport effect without a magnetic field opens up a new direction for valleytronics in two-dimensional-based devices.

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Phys. Rev. Research 3, 033160– Published 16 August, 2021
  • Received 12 April 2021
  • Revised 28 July 2021
  • Accepted 29 July 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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