Resonant excitation and imaging of nonequilibrium exciton spins in single core-shell GaAs-AIGaAs nanowires

Thang Ba Hoang; Lyubov V. Titova; Jan M. Yarrison-Rice; Howard E. Jackson; Alexander O. Govorov; Yong Kim; Hannah J. Joyce; H. Hoe Tan; Chennupati Jagadish; Leigh M. Smith

doi:10.1021/nl062383q

Resonant excitation and imaging of nonequilibrium exciton spins in single core-shell GaAs-AIGaAs nanowires

Thang Ba Hoang, Lyubov V. Titova, Jan M. Yarrison-Rice, Howard E. Jackson, Alexander O. Govorov, Yong Kim, Hannah J. Joyce, H. Hoe Tan, Chennupati Jagadish, Leigh M. Smith^*

^*Corresponding author for this work

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

42 Citations (Scopus)

Abstract

Nonequilibrium spin distributions in single GaAs/AIGaAs core-shell nanowires are excited using resonant polarized excitation at 10 K. At all excitation energies, we observe strong photoluminescence polarization due to suppressed radiative recombination of excitons with dipoles aligned perpendicular to the nanowire. Excitation resonances are observed at 1- or 2-LO phonon energies above the exciton ground states. Using rate equation modeling, we show that, at the lowest energies, strongly nonequilibrium spin distributions are present and we estimate their spin relaxation rate.

Original language	English
Pages (from-to)	588-595
Number of pages	8
Journal	Nano Letters
Volume	7
Issue number	3
DOIs	https://doi.org/10.1021/nl062383q
Publication status	Published - Mar 2007

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@article{4385c26ad44541ea9fbe3fe9e1dfb91f,

title = "Resonant excitation and imaging of nonequilibrium exciton spins in single core-shell GaAs-AIGaAs nanowires",

abstract = "Nonequilibrium spin distributions in single GaAs/AIGaAs core-shell nanowires are excited using resonant polarized excitation at 10 K. At all excitation energies, we observe strong photoluminescence polarization due to suppressed radiative recombination of excitons with dipoles aligned perpendicular to the nanowire. Excitation resonances are observed at 1- or 2-LO phonon energies above the exciton ground states. Using rate equation modeling, we show that, at the lowest energies, strongly nonequilibrium spin distributions are present and we estimate their spin relaxation rate.",

author = "Hoang, {Thang Ba} and Titova, {Lyubov V.} and Yarrison-Rice, {Jan M.} and Jackson, {Howard E.} and Govorov, {Alexander O.} and Yong Kim and Joyce, {Hannah J.} and Tan, {H. Hoe} and Chennupati Jagadish and Smith, {Leigh M.}",

year = "2007",

month = mar,

doi = "10.1021/nl062383q",

language = "English",

volume = "7",

pages = "588--595",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "3",

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TY - JOUR

T1 - Resonant excitation and imaging of nonequilibrium exciton spins in single core-shell GaAs-AIGaAs nanowires

AU - Hoang, Thang Ba

AU - Titova, Lyubov V.

AU - Yarrison-Rice, Jan M.

AU - Jackson, Howard E.

AU - Govorov, Alexander O.

AU - Kim, Yong

AU - Joyce, Hannah J.

AU - Tan, H. Hoe

AU - Jagadish, Chennupati

AU - Smith, Leigh M.

PY - 2007/3

Y1 - 2007/3

N2 - Nonequilibrium spin distributions in single GaAs/AIGaAs core-shell nanowires are excited using resonant polarized excitation at 10 K. At all excitation energies, we observe strong photoluminescence polarization due to suppressed radiative recombination of excitons with dipoles aligned perpendicular to the nanowire. Excitation resonances are observed at 1- or 2-LO phonon energies above the exciton ground states. Using rate equation modeling, we show that, at the lowest energies, strongly nonequilibrium spin distributions are present and we estimate their spin relaxation rate.

AB - Nonequilibrium spin distributions in single GaAs/AIGaAs core-shell nanowires are excited using resonant polarized excitation at 10 K. At all excitation energies, we observe strong photoluminescence polarization due to suppressed radiative recombination of excitons with dipoles aligned perpendicular to the nanowire. Excitation resonances are observed at 1- or 2-LO phonon energies above the exciton ground states. Using rate equation modeling, we show that, at the lowest energies, strongly nonequilibrium spin distributions are present and we estimate their spin relaxation rate.

UR - http://www.scopus.com/inward/record.url?scp=34047153017&partnerID=8YFLogxK

U2 - 10.1021/nl062383q

DO - 10.1021/nl062383q

M3 - Article

SN - 1530-6984

VL - 7

SP - 588

EP - 595

JO - Nano Letters

JF - Nano Letters

IS - 3

ER -

Resonant excitation and imaging of nonequilibrium exciton spins in single core-shell GaAs-AIGaAs nanowires

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