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Related Experiment Videos

Polaron Mobility in the "Beyond Quasiparticles" Regime.

Andrey S Mishchenko1,2, Lode Pollet3, Nikolay V Prokof'ev2,4

  • 1RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan.

Physical Review Letters
|September 7, 2019
PubMed
Summary

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This study explores the "beyond quasiparticles" regime in electron-phonon coupling using diagrammatic Monte Carlo. It reveals nonperturbative effects on polaron mobility, crucial for understanding complex materials.

Area of Science:

  • Condensed Matter Physics
  • Quantum Materials Science

Background:

  • The
  • beyond quasiparticles
  • regime, where inelastic scattering dominates, challenges conventional transport theories.
  • This regime is relevant in systems like polarons, Dirac liquids, and non-Fermi liquids.

Purpose of the Study:

  • To investigate the charge transport properties of a Fröhlich polaron in the
  • beyond quasiparticles
  • regime.
  • To identify and characterize nonperturbative effects on polaron mobility.

Main Methods:

  • Diagrammatic Monte Carlo simulations were employed.
  • The study focused on the mobility of a Fröhlich polaron.

Related Experiment Videos

Main Results:

  • Observed strong violation of the Mott-Ioffe-Regel criterion at intermediate and strong couplings.
  • Identified a mobility minimum at T∼Ω (optical mode frequency) in the strong-coupling limit.
  • Found a delayed onset of exponential mobility dependence for T<Ω and complete Drude peak smearing at strong coupling.

Conclusions:

  • The findings highlight significant nonperturbative effects in polaron transport.
  • These effects are critical for accurate interpretation of mobility data in materials with strong electron-phonon coupling.