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We demonstrate electrostatic control over phonon angular momentum in strained graphene using magneto-phonon resonances. This tuning of phonon polarization opens new avenues for phononic device applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Uniaxial strain in graphene lifts the degeneracy of longitudinal optical (LO) and transverse optical (TO) phonons.
  • This strain-induced effect results in two cross-linearly polarized phonon modes and a splitting of the Raman G peak.

Purpose of the Study:

  • To explore the tunability of phonon polarization in suspended uniaxially strained graphene.
  • To investigate the role of magneto-phonon resonances in controlling phonon polarization.
  • To achieve electrostatic control over phonon angular momentum for phononic applications.

Main Methods:

  • Utilizing strong electron-phonon coupling in graphene.
  • Employing off-resonant coupling to a magneto-phonon resonance.
  • Inducing gate-tunable circular phonon dichroism via electrostatic fields.
  • Analyzing strain-induced splitting of the Raman G peak.

Main Results:

  • Controllable tuning of linearly polarized G mode phonons into circular phonon modes.
  • Achieved up to 40% circular phonon polarization using solely electrostatic fields.
  • Demonstrated reversal of circular phonon polarization sign by tuning electron/hole doping.

Conclusions:

  • Unprecedented electrostatic control over phonon angular momentum in strained graphene is achieved.
  • The developed method provides a pathway for novel phononic applications.
  • This work highlights the potential of electrostatic fields in manipulating phonon properties.