We investigate the optical properties of InAs self-assembled quantum dots grown on (N11)A/B GaAs substrates, by means of cw photoluminescence under different excitation power densities. We observe a sizeable blue-shift of photoluminescence band induced by increasing the photogenerated carrier density. The shift depends on the substrate orientation and exhibits a strong asymmetric dependence on the substrate termination. We attribute the photoluminescence blue-shift to a reverse quantum confined Stark shift of ground state transition energies in the quantum dots. This effect arises from the photogenerated charge screening of the built-in piezoelectric field present in such strained structures grown on high index planes.

Piezoelectric-induced confined Stark effects in self-assembled InAs quantum dots grown on (N11) GaAs substrates / S. SANGUINETTI; M. GURIOLI; E. GRILLI; M. GUZZI; M. HENINI. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 77:(2000), pp. 1982-1984. [10.1063/1.1311814]

Piezoelectric-induced confined Stark effects in self-assembled InAs quantum dots grown on (N11) GaAs substrates

GURIOLI, MASSIMO;
2000

Abstract

We investigate the optical properties of InAs self-assembled quantum dots grown on (N11)A/B GaAs substrates, by means of cw photoluminescence under different excitation power densities. We observe a sizeable blue-shift of photoluminescence band induced by increasing the photogenerated carrier density. The shift depends on the substrate orientation and exhibits a strong asymmetric dependence on the substrate termination. We attribute the photoluminescence blue-shift to a reverse quantum confined Stark shift of ground state transition energies in the quantum dots. This effect arises from the photogenerated charge screening of the built-in piezoelectric field present in such strained structures grown on high index planes.
2000
77
1982
1984
S. SANGUINETTI; M. GURIOLI; E. GRILLI; M. GUZZI; M. HENINI
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/211258
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