Optical conductivity of polarons: Double phonon cloud concept verified by diagrammatic Monte Carlo simulations (Articolo in rivista)

Type
Label
  • Optical conductivity of polarons: Double phonon cloud concept verified by diagrammatic Monte Carlo simulations (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.85.094302 (literal)
Alternative label
  • G. De Filippis1, V. Cataudella1, A. S. Mishchenko2,3, and N. Nagaosa2,4 (2012)
    Optical conductivity of polarons: Double phonon cloud concept verified by diagrammatic Monte Carlo simulations
    in Physical review. B, Condensed matter and materials physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G. De Filippis1, V. Cataudella1, A. S. Mishchenko2,3, and N. Nagaosa2,4 (literal)
Pagina inizio
  • 94302 (literal)
Pagina fine
  • 5 (literal)
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  • http://link.aps.org/doi/10.1103/PhysRevB.85.094302 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 85 (literal)
Rivista
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  • 5 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 9 (literal)
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  • 1SPIN-CNR and Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli, Italy 2Cross-Correlated Materials Research Group (CMRG), ASI, RIKEN, Wako 351-0198, Japan 3RRC \"Kurchatov Institute,\" 123182, Moscow, Russia 4Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan (literal)
Titolo
  • Optical conductivity of polarons: Double phonon cloud concept verified by diagrammatic Monte Carlo simulations (literal)
Abstract
  • 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 the diagrammatic Monte Carlo method and the data obtained 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. (literal)
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