2007/12/31 by Andrea Marini
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Boron and Carbon Nanomaterials Research #Semiconductor materials and devices #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevlett.101.106405
4 pages, 2 figures
arxiv created 2008/07/20 · openalex publication_date 2008/09/04 · arxiv updated 2009/12/01 · openalex created_date 2016/09/16 · openalex updated_date 2026/07/28
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.