Optical spectroscopy of charged excitons in single quantum dot photodiodes

被引:71
作者
Baier, M [1 ]
Findeis, F [1 ]
Zrenner, A [1 ]
Bichler, M [1 ]
Abstreiter, G [1 ]
机构
[1] Tech Univ Munich, Walter Schottky Inst, D-85738 Garching, Germany
关键词
D O I
10.1103/PhysRevB.64.195326
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
By means of photoluminescence spectroscopy we compare the bias dependent emissions of single quantum dots which are embedded in two differently designed photodiode structures. Controlled single-electron charging allows to identify neutral, single- and double-charged excitons; in the optical spectra of both samples. The strength of the tunneling coupling between the quantum dots and the diode's n region is found to have a strong influence on the observed spectral features-in particular, the parallel appearance of emission lines resulting from the radiative decay of differently charged quantum dot states is suppressed in case of strong tunneling interaction.
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页数:5
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