Observation of long-lived excitons in InAs quantum dots under thermal redistribution temperature

Chun Cheng; Sheng-Di Lin; Chien-Hung Pan; Chien Hung Lin; Ying Jhe Fu

doi:10.1016/j.physleta.2012.03.015

Observation of long-lived excitons in InAs quantum dots under thermal redistribution temperature

Chun Cheng, Sheng-Di Lin^*, Chien-Hung Pan, Chien Hung Lin, Ying Jhe Fu

^*Corresponding author for this work

Institute of Electronics

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

3 Scopus citations

Abstract

We study the temperature-dependent time-resolved photoluminescence (TRPL) of self-assembled InAs quantum dots (QDs). Under low excitation power, a surprisingly long PL decay time is observed at about 60 K, under the thermal redistribution temperature. The long decay time decreases with increasing excitation power but is nearly independent of the detection energy of TRPL measurements. A model considering the spin relaxation through the excited excitonic state is proposed to quantitatively explain the unusual phenomena. The rate equation analysis indicates that the observation of long-lived excitons is caused by the shortened spin-flip time.

Original language	English
Pages (from-to)	1495-1498
Number of pages	4
Journal	Physics Letters, Section A: General, Atomic and Solid State Physics
Volume	376
Issue number	17
DOIs	https://doi.org/10.1016/j.physleta.2012.03.015
State	Published - 26 Mar 2012

Keywords

Quantum dot
Spin-flip
Time-resolved photoluminescence

Access to Document

10.1016/j.physleta.2012.03.015

Cite this

@article{e148aa25622a4724a0991e94a5bca31f,

title = "Observation of long-lived excitons in InAs quantum dots under thermal redistribution temperature",

abstract = "We study the temperature-dependent time-resolved photoluminescence (TRPL) of self-assembled InAs quantum dots (QDs). Under low excitation power, a surprisingly long PL decay time is observed at about 60 K, under the thermal redistribution temperature. The long decay time decreases with increasing excitation power but is nearly independent of the detection energy of TRPL measurements. A model considering the spin relaxation through the excited excitonic state is proposed to quantitatively explain the unusual phenomena. The rate equation analysis indicates that the observation of long-lived excitons is caused by the shortened spin-flip time.",

keywords = "Quantum dot, Spin-flip, Time-resolved photoluminescence",

author = "Chun Cheng and Sheng-Di Lin and Chien-Hung Pan and Lin, {Chien Hung} and Fu, {Ying Jhe}",

year = "2012",

month = mar,

day = "26",

doi = "10.1016/j.physleta.2012.03.015",

language = "English",

volume = "376",

pages = "1495--1498",

journal = "Physics Letters, Section A: General, Atomic and Solid State Physics",

issn = "0375-9601",

publisher = "Elsevier B.V.",

number = "17",

}

TY - JOUR

T1 - Observation of long-lived excitons in InAs quantum dots under thermal redistribution temperature

AU - Cheng, Chun

AU - Lin, Sheng-Di

AU - Pan, Chien-Hung

AU - Lin, Chien Hung

AU - Fu, Ying Jhe

PY - 2012/3/26

Y1 - 2012/3/26

N2 - We study the temperature-dependent time-resolved photoluminescence (TRPL) of self-assembled InAs quantum dots (QDs). Under low excitation power, a surprisingly long PL decay time is observed at about 60 K, under the thermal redistribution temperature. The long decay time decreases with increasing excitation power but is nearly independent of the detection energy of TRPL measurements. A model considering the spin relaxation through the excited excitonic state is proposed to quantitatively explain the unusual phenomena. The rate equation analysis indicates that the observation of long-lived excitons is caused by the shortened spin-flip time.

AB - We study the temperature-dependent time-resolved photoluminescence (TRPL) of self-assembled InAs quantum dots (QDs). Under low excitation power, a surprisingly long PL decay time is observed at about 60 K, under the thermal redistribution temperature. The long decay time decreases with increasing excitation power but is nearly independent of the detection energy of TRPL measurements. A model considering the spin relaxation through the excited excitonic state is proposed to quantitatively explain the unusual phenomena. The rate equation analysis indicates that the observation of long-lived excitons is caused by the shortened spin-flip time.

KW - Quantum dot

KW - Spin-flip

KW - Time-resolved photoluminescence

UR - http://www.scopus.com/inward/record.url?scp=84862807142&partnerID=8YFLogxK

U2 - 10.1016/j.physleta.2012.03.015

DO - 10.1016/j.physleta.2012.03.015

M3 - Article

AN - SCOPUS:84862807142

SN - 0375-9601

VL - 376

SP - 1495

EP - 1498

JO - Physics Letters, Section A: General, Atomic and Solid State Physics

JF - Physics Letters, Section A: General, Atomic and Solid State Physics

IS - 17

ER -

Observation of long-lived excitons in InAs quantum dots under thermal redistribution temperature

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this