Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-11-22
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages
Scientific paper
We study theoretically a fundamental issue in solids: the evolution of the optical spectra of polaron as the electron-phonon coupling increases. By comparing the exact results obtained by diagrammatic Monte Carlo method and the data got through exact diagonalization within an appropriate subspace of the phononic wavefunctions, the physical nature of the crossover from weak to strong coupling is revealed. The optical spectra are well understood by the quantum mechanical superposition of states with light and heavy phonon clouds corresponding to large and small polarons, respectively. It is also found that the strong coupling Franck-Condon regime is not accessible at realistic values of the coupling constant.
Cataudella Vittorio
Filippis Giulio de
Mishchenko Alexander S.
Nagaosa Naoto
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