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Condensed Matter > Materials Science

arXiv:1102.5017 (cond-mat)
[Submitted on 24 Feb 2011]

Title:Exciton and interband optical transitions in hBN single crystal

Authors:Luc Museur (LPL), Gurvan Brasse (LEM), Aurélie Pierret (LEM, CEA/INAC/SP2M), Sylvain Maine (LEM), Brigitte Attal-Trétout (DMPH), François Ducastelle (LEM), Annick Loiseau (LEM), Julien Barjon (GEMAC), Kenji Watanabe (NIMS), Takashi Taniguchi (NIMS), Andreï Kanaev (LIMHP)
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Abstract:Near band gap photoluminescence (PL) of hBN single crystal has been studied at cryogenic temperatures with synchrotron radiation excitation. The PL signal is dominated by the D-series previously assigned to excitons trapped on structural defects. A much weaker S-series of self-trapped excitons at 5.778 eV and 5.804 eV has been observed using time-window PL technique. The S-series excitation spectrum shows a strong peak at 6.02 eV, assigned to free exciton absorption. Complementary photoconductivity and PL measurements set the band gap transition energy to 6.4 eV and the Frenkel exciton binding energy larger than 380 meV.
Subjects: Materials Science (cond-mat.mtrl-sci)
Cite as: arXiv:1102.5017 [cond-mat.mtrl-sci]
  (or arXiv:1102.5017v1 [cond-mat.mtrl-sci] for this version)
  https://doi.org/10.48550/arXiv.1102.5017

Submission history

From: Francois Ducastelle [view email] [via CCSD proxy]
[v1] Thu, 24 Feb 2011 15:35:16 UTC (308 KB)
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