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Quasiparticle and Nonquasiparticle Transport in Doped Quantum Paraelectrics
Abhishek Kumar1, Vladimir I Yudson2,3, Dmitrii L Maslov1
1University of Florida, Gainesville, Florida 32611, USA.
Physical Review Letters
|March 5, 2021
Summary
Charge transport in doped quantum paraelectrics exhibits a T² resistivity regime due to electron-phonon interactions. This study explains the T² scattering rate, independent of carrier density, and the non-quasiparticle regime at higher temperatures.
Area of Science:
- Condensed Matter Physics
- Quantum Paraelectrics
- Charge Transport Phenomena
Background:
- Doped quantum paraelectrics (QPs) display puzzling charge transport behaviors.
- A pronounced T² regime in resistivity is observed experimentally.
Purpose of the Study:
- To analyze charge transport in QPs using a theoretical model.
- To explain the observed T² resistivity and scattering mechanisms.
Main Methods:
- Modeling electron coupling to soft transverse optical (TO) modes via a two-phonon mechanism.
- Analyzing the Dyson equation and mapping it to supersymmetric quantum mechanics for non-quasiparticle regimes.
Main Results:
- Resistivity scales as T² for temperatures above the soft-mode frequency but below a characteristic scale E₀.
- The T² scattering rate is independent of carrier density and regime crossover.
- A combination of two-phonon scattering and longitudinal optical mode scattering explains experimental data.
Conclusions:
- The developed model successfully explains the T² resistivity in doped QPs.
- The study clarifies scattering mechanisms and the non-quasiparticle regime in these materials.
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