Browsing by Author "Oka, Y"

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Exciton relaxation in Ga1-xInxAs/GaAs self-organized quantum dots
(1999-01-01)
Shen, JX
;
Oka, Y
;
Cheng, HH
;
Tsai, FY
;
Lee, CP
The exciton dynamics in Ga1-xInxAs/GaAs self-organized quantum dots grown on GaAs (1 1 1)B substrates are studied by the time-resolved photoluminescence (PL). We have found the intra-dot exciton relaxation by the reduction of the linewidth and peak energy and also by the energy-dependent PL rise time in the transient PL spectra. Compared with the energy relaxation in the reference quantum wells, we have confirmed that the exciton relaxation in three-dimensionally confined quantum dots is slower than in the quantum wells, (C) 1999 Academic Press.
Time-resolved photoluminescence study of InGaAs/GaAs quantum wells on (111)B GaAs substrates
(1999-04-01)
Tsai, FY
;
Lee, CP
;
Shen, JX
;
Oka, Y
;
Cheng, HH
The exciton dynamics in In0.15Ga0.85As/GaAs quantum wells grown on (111)B and (100)GaAs substrates are studied by the time-resolved photoluminescence (PL). We have found that the piezoelectric fields in (111)B samples affect the transient behavior of PL spectra. Compared with the reference (100) samples, we have confirmed that the piezoelectric effect induces slower exciton relaxation in (111)B strained quantum wells. (C) 1999 Elsevier Science Ltd. All rights reserved.
Time-resolved photoluminescence study of InGaAs/GaAs quantum wells on (111)B GaAs substrates under magnetic fields
(2001-06-15)
Tsai, FY
;
Lee, CP
;
Voskoboynikov, O
;
Cheng, HH
;
Shen, JX
The exciton dynamics in InxGa1-xAs/GaAs quantum wells grown on (111)B and (100) GaAs substrates were studied by time-resolved photoluminescence (PL) under magnetic fields in a Faraday configuration. We have found that the piezoelectric fields in (111)B samples affect the transient behavior of the PL spectra. Compared with the reference (100) sample, we have found that the strong piezoelectric fields, as well as the magnetic fields, cause a slower spin-flip process in (111)B strained quantum wells. (C) 2001 American Institute of Physics.