We report on a room temperature Raman resonance at 1.56 eV in GaAs wurtzite nanowires together with the emergence of a strong forbidden longitudinal optical phonon line. We attribute this resonance, absent in zinc blende wires with similar diameters, to an additional excitonic transition due to conduction band folding in agreement with recent theoretical predictions. (C) 2012 American Institute of Physics. [doi:10.1063/1.3684837]
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Lund Univ, Solid State Phys & NanoLund, POB 118, SE-22100 Lund, Sweden
Lund Univ, Ctr Anal & Synth, POB 124, SE-22100 Lund, SwedenLund Univ, Solid State Phys & NanoLund, POB 118, SE-22100 Lund, Sweden
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Lund Univ, Solid State Phys & NanoLund, POB 118, SE-22100 Lund, Sweden
Tech Univ Berlin, Inst Festkorperphys, Hardenbergstr 36, D-10623 Berlin, GermanyLund Univ, Solid State Phys & NanoLund, POB 118, SE-22100 Lund, Sweden
Kubitza, Simon
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Lehmann, Sebastian
Samuelson, Lars
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Lund Univ, Solid State Phys & NanoLund, POB 118, SE-22100 Lund, SwedenLund Univ, Solid State Phys & NanoLund, POB 118, SE-22100 Lund, Sweden
Samuelson, Lars
Dick, Kimberly A.
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Lund Univ, Solid State Phys & NanoLund, POB 118, SE-22100 Lund, Sweden
Lund Univ, Ctr Anal & Synth, POB 124, SE-22100 Lund, SwedenLund Univ, Solid State Phys & NanoLund, POB 118, SE-22100 Lund, Sweden