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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
Summary
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.
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.