Spin relaxation in InAs columnar quantum dots

T. Umi; H. Nosho; S. Lu; Lianhe Li; A. Fiore; A. Tackeuchi

doi:10.1143/JJAP.48.04C199

Spin relaxation in InAs columnar quantum dots

T. Umi, H. Nosho, S. Lu, Lianhe Li, A. Fiore, A. Tackeuchi

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

We have investigated carrier spin dynamics in InAs columnar quantum dots (CQDs) by time-resolved photoluminescence (PL) measurement. The CQDs were formed by depositing a 1.8 monolayer InAs seed dot layer and a short-period GaAs/InAs superlattice (SL). The spin relaxation time was found to be prolonged from 1.6 to 5.3 ns by increasing the number of SL periods from 3 to 35. The PL decay time also increased from 0.93 to 1.9 ns, indicating a decrease in the spatial overlap of electron and hole wave functions. The changes in both the spin relaxation time and the PL decay time suggest that the Bir-Aronov-Pikus process is the main spin relaxation mechanism. © 2009 The Japan Society of Applied Physics. U7 - Export Date: 2 August 2010 U7 - Source: Scopus U7 - Art. No.: 04C199

Original language	English
Article number	04C199
Pages (from-to)	04C199-1/3
Number of pages	3
Journal	Journal of Applied Physics
Volume	48
Issue number	4-2
DOIs	https://doi.org/10.1143/JJAP.48.04C199
Publication status	Published - 2009

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title = "Spin relaxation in InAs columnar quantum dots",

abstract = "We have investigated carrier spin dynamics in InAs columnar quantum dots (CQDs) by time-resolved photoluminescence (PL) measurement. The CQDs were formed by depositing a 1.8 monolayer InAs seed dot layer and a short-period GaAs/InAs superlattice (SL). The spin relaxation time was found to be prolonged from 1.6 to 5.3 ns by increasing the number of SL periods from 3 to 35. The PL decay time also increased from 0.93 to 1.9 ns, indicating a decrease in the spatial overlap of electron and hole wave functions. The changes in both the spin relaxation time and the PL decay time suggest that the Bir-Aronov-Pikus process is the main spin relaxation mechanism. {\textcopyright} 2009 The Japan Society of Applied Physics. U7 - Export Date: 2 August 2010 U7 - Source: Scopus U7 - Art. No.: 04C199",

author = "T. Umi and H. Nosho and S. Lu and Lianhe Li and A. Fiore and A. Tackeuchi",

year = "2009",

doi = "10.1143/JJAP.48.04C199",

language = "English",

volume = "48",

pages = "04C199--1/3",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

number = "4-2",

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TY - JOUR

T1 - Spin relaxation in InAs columnar quantum dots

AU - Umi, T.

AU - Nosho, H.

AU - Lu, S.

AU - Li, Lianhe

AU - Fiore, A.

AU - Tackeuchi, A.

PY - 2009

Y1 - 2009

N2 - We have investigated carrier spin dynamics in InAs columnar quantum dots (CQDs) by time-resolved photoluminescence (PL) measurement. The CQDs were formed by depositing a 1.8 monolayer InAs seed dot layer and a short-period GaAs/InAs superlattice (SL). The spin relaxation time was found to be prolonged from 1.6 to 5.3 ns by increasing the number of SL periods from 3 to 35. The PL decay time also increased from 0.93 to 1.9 ns, indicating a decrease in the spatial overlap of electron and hole wave functions. The changes in both the spin relaxation time and the PL decay time suggest that the Bir-Aronov-Pikus process is the main spin relaxation mechanism. © 2009 The Japan Society of Applied Physics. U7 - Export Date: 2 August 2010 U7 - Source: Scopus U7 - Art. No.: 04C199

AB - We have investigated carrier spin dynamics in InAs columnar quantum dots (CQDs) by time-resolved photoluminescence (PL) measurement. The CQDs were formed by depositing a 1.8 monolayer InAs seed dot layer and a short-period GaAs/InAs superlattice (SL). The spin relaxation time was found to be prolonged from 1.6 to 5.3 ns by increasing the number of SL periods from 3 to 35. The PL decay time also increased from 0.93 to 1.9 ns, indicating a decrease in the spatial overlap of electron and hole wave functions. The changes in both the spin relaxation time and the PL decay time suggest that the Bir-Aronov-Pikus process is the main spin relaxation mechanism. © 2009 The Japan Society of Applied Physics. U7 - Export Date: 2 August 2010 U7 - Source: Scopus U7 - Art. No.: 04C199

U2 - 10.1143/JJAP.48.04C199

DO - 10.1143/JJAP.48.04C199

M3 - Article

VL - 48

SP - 04C199-1/3

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 4-2

M1 - 04C199

ER -

Spin relaxation in InAs columnar quantum dots

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