Ab initio finite-temperature excitons (Articolo in rivista)

Type
Label
  • Ab initio finite-temperature excitons (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Alternative label
  • Marini, A (2008)
    Ab initio finite-temperature excitons
    in Physical review letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Marini, A (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 101 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Marini, Andrea] Univ Roma Tor Vergata, INFM, CNR, ETSF,Inst Stat Mech & Complex,CNISM, I-00133 Rome, Italy; [Marini, Andrea] Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy (literal)
Titolo
  • Ab initio finite-temperature excitons (literal)
Abstract
  • The coupling with the lattice vibrations is shown to drastically modify the state-of-the-art picture of the excitonic states based on a frozen-atom approximation. The zero-point vibrations renormalize the bare energies and optical strengths. Excitons acquire a nonradiative lifetime that decreases with increasing temperature. The optical brightness turns out to be strongly temperature-dependent such as to induce bright to dark (and vice versa) transitions. The finite-temperature experimental optical absorption spectra of bulk Si and hexagonal BN are successfully explained without using any external parameter. (literal)
Autore CNR
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