期刊
NANO LETTERS
卷 15, 期 2, 页码 998-1005出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl5038374
关键词
InP nanowires; photoluminescence excitation; wurtzite band structure; dielectric mismatch; excitons
类别
资金
- Sapienza Universita di Roma
- Australian Research Council
- National Science Foundation through NSF [DMR-1105362]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1105362] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1100489] Funding Source: National Science Foundation
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, rho(abs), 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, rho(abs) 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.
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