Exciton dephasing in strain-compensated self-assembled InAs quantum dots

Junko Ishi-Hayase; Kouichi Akahane; Naokatsu Yamamoto; Mamiko Kujiraoka; Kazuhiro Ema; Masahide Sasaki

doi:10.1117/12.661300

Exciton dephasing in strain-compensated self-assembled InAs quantum dots

Junko Ishi-Hayase, Kouichi Akahane, Naokatsu Yamamoto, Mamiko Kujiraoka, Kazuhiro Ema, Masahide Sasaki

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

We investigate the dephasing of excitons in InAs self-assembled quantum dots by using a transient four-wave-mixing technique. A used sample is specially designed to compensate the strain. We observe long-lived coherence of excitons at 5 K which corresponds to the dephasing time longer than a nanosecond, where the photon energy of the excitation pulse is 0.874 eV. We find that a pure dephasing due to exciton-phonon interactions dominates in the exciton dephasing rather than the population decay and the exciton-exciton interaction in the weak excitation region, by analyzing the population lifetime and the polarization-dependent dephasing time. quantum dot, strain compensation, dephasing, four-wave mixing, population lifetime, optical anisotropy.

Original language	English
Title of host publication	Physics and Simulation of Optoelectronic Devices XIV
DOIs	https://doi.org/10.1117/12.661300
Publication status	Published - 2006 May 22
Externally published	Yes
Event	Physics and Simulation of Optoelectronic Devices XIV - San Jose, CA, United States Duration: 2006 Jan 22 → 2006 Jan 26

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	6115
ISSN (Print)	0277-786X

Other

Other	Physics and Simulation of Optoelectronic Devices XIV
Country/Territory	United States
City	San Jose, CA
Period	06/1/22 → 06/1/26

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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10.1117/12.661300

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Exciton dephasing in strain-compensated self-assembled InAs quantum dots. / Ishi-Hayase, Junko; Akahane, Kouichi; Yamamoto, Naokatsu; Kujiraoka, Mamiko; Ema, Kazuhiro; Sasaki, Masahide.

Physics and Simulation of Optoelectronic Devices XIV. 2006. 61151O (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6115).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Ishi-Hayase, J, Akahane, K, Yamamoto, N, Kujiraoka, M, Ema, K & Sasaki, M 2006, Exciton dephasing in strain-compensated self-assembled InAs quantum dots. in Physics and Simulation of Optoelectronic Devices XIV., 61151O, Proceedings of SPIE - The International Society for Optical Engineering, vol. 6115, Physics and Simulation of Optoelectronic Devices XIV, San Jose, CA, United States, 06/1/22. https://doi.org/10.1117/12.661300

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title = "Exciton dephasing in strain-compensated self-assembled InAs quantum dots",

abstract = "We investigate the dephasing of excitons in InAs self-assembled quantum dots by using a transient four-wave-mixing technique. A used sample is specially designed to compensate the strain. We observe long-lived coherence of excitons at 5 K which corresponds to the dephasing time longer than a nanosecond, where the photon energy of the excitation pulse is 0.874 eV. We find that a pure dephasing due to exciton-phonon interactions dominates in the exciton dephasing rather than the population decay and the exciton-exciton interaction in the weak excitation region, by analyzing the population lifetime and the polarization-dependent dephasing time. quantum dot, strain compensation, dephasing, four-wave mixing, population lifetime, optical anisotropy.",

author = "Junko Ishi-Hayase and Kouichi Akahane and Naokatsu Yamamoto and Mamiko Kujiraoka and Kazuhiro Ema and Masahide Sasaki",

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AU - Ishi-Hayase, Junko

AU - Akahane, Kouichi

AU - Yamamoto, Naokatsu

AU - Kujiraoka, Mamiko

AU - Ema, Kazuhiro

AU - Sasaki, Masahide

PY - 2006/5/22

Y1 - 2006/5/22

N2 - We investigate the dephasing of excitons in InAs self-assembled quantum dots by using a transient four-wave-mixing technique. A used sample is specially designed to compensate the strain. We observe long-lived coherence of excitons at 5 K which corresponds to the dephasing time longer than a nanosecond, where the photon energy of the excitation pulse is 0.874 eV. We find that a pure dephasing due to exciton-phonon interactions dominates in the exciton dephasing rather than the population decay and the exciton-exciton interaction in the weak excitation region, by analyzing the population lifetime and the polarization-dependent dephasing time. quantum dot, strain compensation, dephasing, four-wave mixing, population lifetime, optical anisotropy.

AB - We investigate the dephasing of excitons in InAs self-assembled quantum dots by using a transient four-wave-mixing technique. A used sample is specially designed to compensate the strain. We observe long-lived coherence of excitons at 5 K which corresponds to the dephasing time longer than a nanosecond, where the photon energy of the excitation pulse is 0.874 eV. We find that a pure dephasing due to exciton-phonon interactions dominates in the exciton dephasing rather than the population decay and the exciton-exciton interaction in the weak excitation region, by analyzing the population lifetime and the polarization-dependent dephasing time. quantum dot, strain compensation, dephasing, four-wave mixing, population lifetime, optical anisotropy.

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BT - Physics and Simulation of Optoelectronic Devices XIV

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ER -

Exciton dephasing in strain-compensated self-assembled InAs quantum dots

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