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Quantum dynamics of a driven correlated system coupled to phonons
Physical Review Letters
|January 17, 2012
Summary
Electron-phonon coupling impacts charge carrier mobility and current in a doped t-J-Holstein model. Increased coupling can enhance steady-state current, with energy primarily flowing to the spin subsystem for cuprate-like parameters.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- The t-J-Holstein model describes interacting electrons, spins, and lattice vibrations.
- Understanding charge transport in strongly correlated systems is crucial for novel electronic materials.
Purpose of the Study:
- Investigate the nonequilibrium dynamics of a single charge carrier in a doped square lattice.
- Analyze the influence of electron-phonon coupling on carrier mobility and current.
- Determine energy flow pathways within the spin and phonon subsystems.
Main Methods:
- Calculation of the quasistationary state under a static electric field.
- Analysis of the t-J-Holstein model with varying electron-phonon coupling.
- Exploration of energy distribution between spin and phonon subsystems.
Main Results:
- Carrier mobility decreases with increasing electron-phonon coupling.
- Steady-state current increases with electron-phonon coupling in the negative differential resistance regime.
- For cuprate-relevant parameters, most absorbed energy transfers to the spin subsystem.
Conclusions:
- Electron-phonon coupling plays a complex role in charge transport, affecting both mobility and current.
- The spin subsystem is a significant sink for absorbed energy in these models.
- Findings offer insights into the behavior of doped Mott insulators and potential applications.
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