Abstract
We observed excitonic Rabi oscillations (ROs) in quantum dots (QDs) by four-wave mixing (FWM) and pump-probe techniques. When a large number of QDs are excited by a spatially nonuniform laser, the inhomogeneous distribution of the transition dipole moments of the QD excitons and the spa-tial distribution of the input electric field induce distribution of the Rabi frequencies. We investigated this ensemble effect on the ROs of the excitonic polarization and the excitonic population observed in the FWM and pump-probe signals. By calculating the FWM and pump-probe signals including the Gaussian distribution of the pulse area, we first showed that a part of the ensemble effect can be cancelled out only in case of the ROs of the excitonic polarization. This reflects the dif-ferences between the characteristics of excitonic polarization and population.
| Original language | English |
|---|---|
| Pages (from-to) | 952-955 |
| Number of pages | 4 |
| Journal | Physica Status Solidi (A) Applications and Materials Science |
| Volume | 206 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2009 May |
| Externally published | Yes |
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ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Materials Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
Cite this
Ensemble effect on Rabi oscillations of excitons in quantum dots. / Kujiraoka, Mamiko; Hayase, Junko; Akahane, Kouichi; Yamamoto, Naokatsu; Ema, Kazuhiro; Sasaki, Masahide.
In: Physica Status Solidi (A) Applications and Materials Science, Vol. 206, No. 5, 05.2009, p. 952-955.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Ensemble effect on Rabi oscillations of excitons in quantum dots
AU - Kujiraoka, Mamiko
AU - Hayase, Junko
AU - Akahane, Kouichi
AU - Yamamoto, Naokatsu
AU - Ema, Kazuhiro
AU - Sasaki, Masahide
PY - 2009/5
Y1 - 2009/5
N2 - We observed excitonic Rabi oscillations (ROs) in quantum dots (QDs) by four-wave mixing (FWM) and pump-probe techniques. When a large number of QDs are excited by a spatially nonuniform laser, the inhomogeneous distribution of the transition dipole moments of the QD excitons and the spa-tial distribution of the input electric field induce distribution of the Rabi frequencies. We investigated this ensemble effect on the ROs of the excitonic polarization and the excitonic population observed in the FWM and pump-probe signals. By calculating the FWM and pump-probe signals including the Gaussian distribution of the pulse area, we first showed that a part of the ensemble effect can be cancelled out only in case of the ROs of the excitonic polarization. This reflects the dif-ferences between the characteristics of excitonic polarization and population.
AB - We observed excitonic Rabi oscillations (ROs) in quantum dots (QDs) by four-wave mixing (FWM) and pump-probe techniques. When a large number of QDs are excited by a spatially nonuniform laser, the inhomogeneous distribution of the transition dipole moments of the QD excitons and the spa-tial distribution of the input electric field induce distribution of the Rabi frequencies. We investigated this ensemble effect on the ROs of the excitonic polarization and the excitonic population observed in the FWM and pump-probe signals. By calculating the FWM and pump-probe signals including the Gaussian distribution of the pulse area, we first showed that a part of the ensemble effect can be cancelled out only in case of the ROs of the excitonic polarization. This reflects the dif-ferences between the characteristics of excitonic polarization and population.
UR - http://www.scopus.com/inward/record.url?scp=65649084092&partnerID=8YFLogxK
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U2 - 10.1002/pssa.200881307
DO - 10.1002/pssa.200881307
M3 - Article
AN - SCOPUS:65649084092
VL - 206
SP - 952
EP - 955
JO - Physica Status Solidi (A) Applications and Materials Science
JF - Physica Status Solidi (A) Applications and Materials Science
SN - 1862-6300
IS - 5
ER -