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Electron-phonon decoupling in two dimensions.

George McArdle1, Igor V Lerner2

  • 1School of Physics and Astronomy, University of Birmingham, B15 2TT, Birmingham, UK.

Scientific Reports
|December 22, 2021
PubMed
Summary
This summary is machine-generated.

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Researchers found a way to observe many-body localization in electronic systems by achieving electron-phonon decoupling in suspended films. This decoupling is indicated by bistability in electron temperature and observable current-voltage characteristics.

Area of Science:

  • Condensed matter physics
  • Quantum many-body systems
  • Electron-phonon interactions

Background:

  • Observing many-body localization requires decoupling electronic systems from lattice vibrations (phonons).
  • This decoupling is typically only possible in non-equilibrium systems.
  • Suspended films offer a potential platform for achieving this decoupling.

Purpose of the Study:

  • To investigate the possibility of electron-phonon decoupling in suspended films.
  • To identify experimental signatures of this decoupling.
  • To determine the conditions necessary for observing this phenomenon.

Main Methods:

  • Studying the electron-phonon cooling rate in disordered, suspended films with two-dimensional phonons.
  • Deriving the conditions for bistability in electron temperature.

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  • Analyzing nonlinear current-voltage characteristics.

    • Main Results:

    • Electron-phonon decoupling can occur in suspended films, manifesting as bistability in electron temperature.
    • Hysteretic jumps of several orders of magnitude in nonlinear current-voltage characteristics signal this decoupling.
    • The required conditions are achievable in systems with Arrhenius conductivity.

    Conclusions:

    • Suspended films provide a viable system for achieving and observing electron-phonon decoupling.
    • This phenomenon is experimentally detectable via nonlinear electrical transport measurements.
    • The findings are specific to materials exhibiting Arrhenius-type conductivity, not Mott or Efros-Shklovskii hopping.