Quantum Confined Stark Effect in a GaAs/AlGaAs Nanowire Quantum Well Tube Device: Probing Exciton Localization

Bekele H. Badada; Teng Shi; Howard E. Jackson; Leigh M. Smith; Changlin Zheng; Joanne Etheridge; Qiang Gao; H. Hoe Tan; Chennupati Jagadish

doi:10.1021/acs.nanolett.5b04039

Quantum Confined Stark Effect in a GaAs/AlGaAs Nanowire Quantum Well Tube Device: Probing Exciton Localization

Bekele H. Badada, Teng Shi, Howard E. Jackson, Leigh M. Smith^*, Changlin Zheng, Joanne Etheridge, Qiang Gao, H. Hoe Tan, Chennupati Jagadish

^*Corresponding author for this work

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

20 Citations (Scopus)

Abstract

In this Letter, we explore the nature of exciton localization in single GaAs/AlGaAs nanowire quantum well tube (QWT) devices using photocurrent (PC) spectroscopy combined with simultaneous photoluminescence (PL) and photoluminescence excitation (PLE) measurements. Excitons confined to GaAs quantum well tubes of 8 and 4 nm widths embedded into an AlGaAs barrier are seen to ionize at high bias levels. Spectroscopic signatures of the ground and excited states confined to the QWT seen in PL, PLE, and PC data are consistent with simple numerical calculations. The demonstration of good electrical contact with the QWTs enables the study of Stark effect shifts in the sharp emission lines of excitons localized to quantum dot-like states within the QWT. Atomic resolution cross-sectional TEM measurements and an analysis of the quantum confined Stark effect of these dots provide insights into the nature of the exciton localization in these nanostructures.

Original language	English
Pages (from-to)	7847-7852
Number of pages	6
Journal	Nano Letters
Volume	15
Issue number	12
DOIs	https://doi.org/10.1021/acs.nanolett.5b04039
Publication status	Published - 9 Dec 2015

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title = "Quantum Confined Stark Effect in a GaAs/AlGaAs Nanowire Quantum Well Tube Device: Probing Exciton Localization",

abstract = "In this Letter, we explore the nature of exciton localization in single GaAs/AlGaAs nanowire quantum well tube (QWT) devices using photocurrent (PC) spectroscopy combined with simultaneous photoluminescence (PL) and photoluminescence excitation (PLE) measurements. Excitons confined to GaAs quantum well tubes of 8 and 4 nm widths embedded into an AlGaAs barrier are seen to ionize at high bias levels. Spectroscopic signatures of the ground and excited states confined to the QWT seen in PL, PLE, and PC data are consistent with simple numerical calculations. The demonstration of good electrical contact with the QWTs enables the study of Stark effect shifts in the sharp emission lines of excitons localized to quantum dot-like states within the QWT. Atomic resolution cross-sectional TEM measurements and an analysis of the quantum confined Stark effect of these dots provide insights into the nature of the exciton localization in these nanostructures.",

keywords = "Nanowires, Stark effect, heterostructures, photocurrent, quantum well",

author = "Badada, {Bekele H.} and Teng Shi and Jackson, {Howard E.} and Smith, {Leigh M.} and Changlin Zheng and Joanne Etheridge and Qiang Gao and Tan, {H. Hoe} and Chennupati Jagadish",

note = "Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2015",

month = dec,

day = "9",

doi = "10.1021/acs.nanolett.5b04039",

language = "English",

volume = "15",

pages = "7847--7852",

journal = "Nano Letters",

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T1 - Quantum Confined Stark Effect in a GaAs/AlGaAs Nanowire Quantum Well Tube Device

T2 - Probing Exciton Localization

AU - Badada, Bekele H.

AU - Shi, Teng

AU - Jackson, Howard E.

AU - Smith, Leigh M.

AU - Zheng, Changlin

AU - Etheridge, Joanne

AU - Gao, Qiang

AU - Tan, H. Hoe

AU - Jagadish, Chennupati

PY - 2015/12/9

Y1 - 2015/12/9

N2 - In this Letter, we explore the nature of exciton localization in single GaAs/AlGaAs nanowire quantum well tube (QWT) devices using photocurrent (PC) spectroscopy combined with simultaneous photoluminescence (PL) and photoluminescence excitation (PLE) measurements. Excitons confined to GaAs quantum well tubes of 8 and 4 nm widths embedded into an AlGaAs barrier are seen to ionize at high bias levels. Spectroscopic signatures of the ground and excited states confined to the QWT seen in PL, PLE, and PC data are consistent with simple numerical calculations. The demonstration of good electrical contact with the QWTs enables the study of Stark effect shifts in the sharp emission lines of excitons localized to quantum dot-like states within the QWT. Atomic resolution cross-sectional TEM measurements and an analysis of the quantum confined Stark effect of these dots provide insights into the nature of the exciton localization in these nanostructures.

AB - In this Letter, we explore the nature of exciton localization in single GaAs/AlGaAs nanowire quantum well tube (QWT) devices using photocurrent (PC) spectroscopy combined with simultaneous photoluminescence (PL) and photoluminescence excitation (PLE) measurements. Excitons confined to GaAs quantum well tubes of 8 and 4 nm widths embedded into an AlGaAs barrier are seen to ionize at high bias levels. Spectroscopic signatures of the ground and excited states confined to the QWT seen in PL, PLE, and PC data are consistent with simple numerical calculations. The demonstration of good electrical contact with the QWTs enables the study of Stark effect shifts in the sharp emission lines of excitons localized to quantum dot-like states within the QWT. Atomic resolution cross-sectional TEM measurements and an analysis of the quantum confined Stark effect of these dots provide insights into the nature of the exciton localization in these nanostructures.

KW - Nanowires

KW - Stark effect

KW - heterostructures

KW - photocurrent

KW - quantum well

UR - http://www.scopus.com/inward/record.url?scp=84949570953&partnerID=8YFLogxK

U2 - 10.1021/acs.nanolett.5b04039

DO - 10.1021/acs.nanolett.5b04039

M3 - Article

SN - 1530-6984

VL - 15

SP - 7847

EP - 7852

JO - Nano Letters

JF - Nano Letters

IS - 12

ER -

Quantum Confined Stark Effect in a GaAs/AlGaAs Nanowire Quantum Well Tube Device: Probing Exciton Localization

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