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.

Polarized Light Absorption in Wurtzite InP Nanowire Ensembles / DE LUCA, Marta; Attilio, Zilli; H., Aruni Fonseka; Sudha, Mokkapati; Miriametro, Antonio; Hark Hoe, Tan; Leigh Morris, Smith; Chennupati, Jagadish; Capizzi, Mario; Polimeni, Antonio. - In: NANO LETTERS. - ISSN 1530-6984. - 15:(2015), pp. 998-1005. [10.1021/nl5038374]

Polarized Light Absorption in Wurtzite InP Nanowire Ensembles

DE LUCA, MARTA;MIRIAMETRO, Antonio;CAPIZZI, Mario;POLIMENI, Antonio
2015

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.
2015
InP nanowires photoluminescence excitation wurtzite band structure dielectric mismatch excitons
01 Pubblicazione su rivista::01a Articolo in rivista
Polarized Light Absorption in Wurtzite InP Nanowire Ensembles / DE LUCA, Marta; Attilio, Zilli; H., Aruni Fonseka; Sudha, Mokkapati; Miriametro, Antonio; Hark Hoe, Tan; Leigh Morris, Smith; Chennupati, Jagadish; Capizzi, Mario; Polimeni, Antonio. - In: NANO LETTERS. - ISSN 1530-6984. - 15:(2015), pp. 998-1005. [10.1021/nl5038374]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/771786
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