期刊
PHYSICAL REVIEW B
卷 79, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.180301
关键词
electron-phonon interactions; ground states; impurities; impurity states; localised states; Monte Carlo methods; phase diagrams; polarons; thermodynamics
资金
- RFBR [07-02-00067a, 15104006, 16076205, 17105002, 19048015]
- NAREGI Japan
- DFG [SFB 652]
We solve the problem of polaron localization on an attractive impurity by means of direct-space diagrammatic Monte Carlo implemented for the system in the thermodynamic limit. In particular we determine the ground-state phase diagram in dependence on the electron-phonon coupling and impurity potential strength for the whole phonon frequency range. Including the quantum phonon effects we find and characterize a phase where self-trapped polarons are not localized at shallow impurities, which is missing in the adiabatic approximation. We show that near the localization transition a region with a mixture of weak- and strong-coupling spectral responses is realized.
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