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Phonon Dephasing Dynamics in MoS2.

Liuyang Sun1, Parveen Kumar2,3, Zeyu Liu4

  • 1Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States.

Nano Letters
|January 28, 2021
PubMed
Summary
This summary is machine-generated.

We measured phonon decoherence in molybdenum disulfide (MoS2) using lasers. The E2g optical phonon mode showed a room-temperature dephasing time of ~7 ps, extending to ~20 ps at low temperatures.

Keywords:
phonon dephasingscattering phase spacetransient coherent ultrafast phonon spectroscopytransition metal dichalcogenides

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Area of Science:

  • Quantum information science
  • Condensed matter physics
  • Materials science

Background:

  • Atomically thin van der Waals materials offer quantum degrees of freedom for quantum information applications.
  • These quantum properties interact with phonons, influencing their coherence.
  • Understanding phonon decoherence is crucial for developing robust quantum technologies.

Purpose of the Study:

  • To directly measure the intrinsic optical phonon decoherence in monolayer and bulk molybdenum disulfide (MoS2).
  • To investigate the temperature dependence of phonon dephasing times.
  • To elucidate the mechanisms underlying optical phonon decay.

Main Methods:

  • Utilized time-resolved spectral interference of Stokes photons generated by pulsed lasers.
  • Measured the temporal evolution of phonon-induced spectral changes.
  • Performed first-principles calculations to model phonon decay processes.

Main Results:

  • The prominent E2g optical phonon mode in MoS2 exhibits a room-temperature dephasing time of approximately 7 picoseconds (ps) for both monolayer and bulk.
  • At low temperatures (~15 K), the dephasing time in bulk MoS2 extends to approximately 20 ps.
  • First-principles calculations indicate that optical phonons decay through three-phonon processes, generating pairs of acoustic phonons.

Conclusions:

  • The measured phonon dephasing times provide critical insights into the coherence properties of MoS2.
  • The extended dephasing times at low temperatures suggest potential for improved quantum information processing.
  • The identified three-phonon decay mechanism is key to understanding phonon dynamics in MoS2.