http://www.cnr.it/ontology/cnr/individuo/prodotto/ID3707
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)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
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- Rivista
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- 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)
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