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Electrical Control over Phonon Polarization in Strained Graphene

Cite this: Nano Lett. 2021, 21, 7, 2898–2904
Publication Date (Web):April 2, 2021
https://doi.org/10.1021/acs.nanolett.0c05043
Copyright © 2021 The Authors. Published by American Chemical Society
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Abstract

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We explore the tunability of the phonon polarization in suspended uniaxially strained graphene by magneto-phonon resonances. The uniaxial strain lifts the degeneracy of the LO and TO phonons, yielding two cross-linearly polarized phonon modes and a splitting of the Raman G peak. We utilize the strong electron–phonon coupling in graphene and the off-resonant coupling to a magneto-phonon resonance to induce a gate-tunable circular phonon dichroism. This, together with the strain-induced splitting of the G peak, allows us to controllably tune the two linearly polarized G mode phonons into circular phonon modes. We are able to achieve a circular phonon polarization of up to 40% purely by electrostatic fields and can reverse its sign by tuning from electron to hole doping. This provides unprecedented electrostatic control over the angular momentum of phonons, which paves the way toward phononic applications.

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The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.nanolett.0c05043.

  • Details on the experimental methods, phonon self-energy for fitting of the MPRs, more background on the six-level model, electronic transport data, and data on the 2D peak of graphene (PDF)

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Cited By


This article is cited by 3 publications.

  1. Wen-Yu Shan. Anomalous circular phonon dichroism in transition metal dichalcogenides. Physical Review B 2022, 105 (12) https://doi.org/10.1103/PhysRevB.105.L121302
  2. Joaquín Medina Dueñas, Hernán L. Calvo, Luis E. F. Foa Torres. Copropagating Edge States Produced by the Interaction between Electrons and Chiral Phonons in Two-Dimensional Materials. Physical Review Letters 2022, 128 (6) https://doi.org/10.1103/PhysRevLett.128.066801
  3. Guohuan Xiong, Zhizhou Yu, Lifa Zhang. Interband chiral phonon transfer in a magnetic field. Physical Review B 2022, 105 (2) https://doi.org/10.1103/PhysRevB.105.024312

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