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物理学报  2013 

Optical transition of the charged excitons in InAs single quantum dots
电场调谐InAs量子点荷电激子光学跃迁

Keywords: InAs quantum dot,excitons,photoluminescence spectrum,electric tuning
InAs量子点
,激子,荧光光谱,电场调谐

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Abstract:

Quantum dot (QD) samples studied in the experiment are grown by molecular-beam epitaxy on semi-insulating GaAs substrates. The photoluminescences (PLs) of the excitons in a single QD are measured at 5 K. The PL spectra of the excitons, biexcitons and charged excitons are identified by measuring and analyzing both PL peaks of the circular and linear polarization and power-dependent PL properties. The charged exciton emissions can be tuned by applying a bias voltage, i.e., negatively charged excitons are changed into positively charged excitons by changing the voltage from 1.0 to -1.0 V. It is shown that the electron-spin will slowly relax compared with that of the hole when they relax from wetting layer into the QD.

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