E sub(1)(A) Electronic Band Gap in Wurtzite InAs Nanowires Studied by Resonant Raman Scattering

We report on resonant Raman experiments carried out on wurtzite InAs nanowires. Resonant conditions have been obtained by tuning either the excitation energy or the band gap through external high pressure at fixed excitation energy. A complete azimuthal study of the Raman spectra with two laser exci...

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Bibliographic Details
Published inNano letters Vol. 13; no. 7; pp. 3011 - 3016-3011-3016
Main Authors Zardo, Ilaria, Yazji, Sara, Hormann, Nicolas, Hertenberger, Simon, Funk, Stefan, Mangialardo, Sara, Morkotter, Stefanie, Koblmueller, Gregor, Postorino, Paolo, Abstreiter, Gerhard
Format Journal Article
LanguageEnglish
Published 01.07.2013
Subjects
Band theory
Excitation
Indium arsenides
Lasers
Mathematical analysis
Nanowires
Tuning
Wurtzite
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Summary:We report on resonant Raman experiments carried out on wurtzite InAs nanowires. Resonant conditions have been obtained by tuning either the excitation energy or the band gap through external high pressure at fixed excitation energy. A complete azimuthal study of the Raman spectra with two laser excitation lines (2.41 and 1.92 eV) has also been performed on a single wire. The measured E sub(2) super(H) mode resonance indicates that the E sub(1)(A) gap is about 2.4 eV, which is considerably reduced with respect to the zinc-blende InAs E sub(1) gap. These findings confirm recent theoretical calculations of crystal phase induced bandstructure modifications.
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ISSN:1530-6984
1530-6992
DOI:10.1021/nl304528j