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Polarized light absorption in wurtzite InP nanowire ensembles

De Luca, Marta, Zilli, A, Fonseka, H. Aruni, Mokkapati, Sudha, Miriametro, Antonio, Tan, Hark Hoe, Smith, Leigh Morris, Jagadish, Chennupati, Capizzi, Mario and Polimeni, Antonio 2015. Polarized light absorption in wurtzite InP nanowire ensembles. Nano Letters 15 (2) , pp. 998-1005. 10.1021/nl5038374

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Abstract

We investigate the absorption properties of ensembles of wurtzite (WZ) InP nanowires (NWs) by high-resolution polarization-resolved photoluminescence excitation (PLE) spectroscopy at T = 10 K. The degree of linear polarization of absorbed light, ρabs, resulting from the PLE spectra is governed by a competition between the dielectric mismatch effect and the WZ selection rules acting differently on different optical transitions. These two contributions are deconvoluted with the help of finite-difference time-domain simulations, thus providing information about the symmetry of the three highest valence bands (A, B, and C) of WZ InP and the extent of the spin–orbit interaction on these states. Moreover, ρabs shows two characteristic dips corresponding to the two sharp A and B exciton resonances in the PLE spectra. A model developed for the dip in A provides the first experimental evidence of an enhancement in the dielectric mismatch effect originating from the Coulomb interaction between electron and hole.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Uncontrolled Keywords: dielectric mismatch; excitons; InP nanowires; photoluminescence excitation; wurtzite band structure
Publisher: American Chemical Society
ISSN: 1530-6984
Last Modified: 04 Oct 2019 13:21
URI: http://orca-mwe.cf.ac.uk/id/eprint/100865

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