Quantum Monte Carlo results for bipolaron stability in quantum dots
arXiv:0707.1770 · doi:10.1103/PhysRevB.76.155122
Abstract
Bipolaron formation in a two-dimensional lattice with harmonic confinement, representing a simplified model for a quantum dot, is investigated by means of quantum Monte Carlo simulations. This method treats all interactions exactly and takes into account quantum lattice fluctuations. Calculations of the bipolaron binding energy reveal that confinement opposes bipolaron formation for weak electron-phonon coupling, but abets a bound state at intermediate to strong coupling. Tuning the system from weak to strong confinement gives rise to a small reduction of the minimum Frohlich coupling parameter for the existence of a bound state.
5 pages, 2 figures, final version to appear in Phys. Rev. B
References in corpus (12)
- Mobile small polaron
- Polarons and bipolarons in strongly interacting electron-phonon systems
- Two-dimensional Hubbard-Holstein bipolaron
- Current hysteresis and memory effect in a molecular quantum dot with strong electron-vibron interaction
- Pair tunneling through single molecules
- Lattice polaron formation: Effects of non-screened electron-phonon interaction
- Electron-Phonon Interacation in Quantum Dots: A Solvable Model
- Superlight small bipolarons in the presence of strong Coulomb repulsion
- Enhanced Shot Noise in Tunneling through a Stack of Coupled Quantum Dots
- Temperature- and quantum phonon effects on Holstein-Hubbard bipolarons
- Spin Current and Shot Noise in Single-Molecule Quantum Dots with a Phonon Mode
- Bipolaron formation in 1D-3D quantum dots: A lattice quantum Monte Carlo approach
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- Thermal transport of molecular junctions in the pair tunneling regime
- Lattice exciton-polaron problem by quantum Monte Carlo simulations