Controlled generation of neutral, negatively-charged and positively-charged excitons in the same single quantum dot

M. Ediger; P. A. Dalgarno; J. M. Smith; B. D. Gerardot; R. J. Warburton; K. Karrai; P. M. Petroff

doi:10.1063/1.1937996

Controlled generation of neutral, negatively-charged and positively-charged excitons in the same single quantum dot

M. Ediger, P. A. Dalgarno, J. M. Smith, B. D. Gerardot, R. J. Warburton, K. Karrai, P. M. Petroff

School of Engineering & Physical Sciences

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

47 Citations (Scopus)

Abstract

We report the controlled generation of neutral, negatively-charged and positively-charged excitons in the same single InAs quantum dot. The control parameters are a vertical electric field applied to a capacitor-like structure, in which the quantum dots are embedded, and optical pump power. The strong Coulomb blockade in quantum dots can be exploited to control the charge of excitons containing one hole, the neutral exciton, X0, and singly negatively charged exciton, X1-. We show here how this concept can be extended to excitons containing two holes, the biexciton, 2 X0, and significantly the singly positively charged exciton, X1+. We support all these assignments with a Coulomb blockade model. For all dots, the emission from the X1- is redshifted relative to the neutral exciton, but surprisingly we observe blueshifts as well as small redshifts for X1+. © 2005 American Institute of Physics.

Original language	English
Article number	211909
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	21
DOIs	https://doi.org/10.1063/1.1937996
Publication status	Published - 23 May 2005

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10.1063/1.1937996

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title = "Controlled generation of neutral, negatively-charged and positively-charged excitons in the same single quantum dot",

abstract = "We report the controlled generation of neutral, negatively-charged and positively-charged excitons in the same single InAs quantum dot. The control parameters are a vertical electric field applied to a capacitor-like structure, in which the quantum dots are embedded, and optical pump power. The strong Coulomb blockade in quantum dots can be exploited to control the charge of excitons containing one hole, the neutral exciton, X0, and singly negatively charged exciton, X1-. We show here how this concept can be extended to excitons containing two holes, the biexciton, 2 X0, and significantly the singly positively charged exciton, X1+. We support all these assignments with a Coulomb blockade model. For all dots, the emission from the X1- is redshifted relative to the neutral exciton, but surprisingly we observe blueshifts as well as small redshifts for X1+. {\textcopyright} 2005 American Institute of Physics.",

author = "M. Ediger and Dalgarno, {P. A.} and Smith, {J. M.} and Gerardot, {B. D.} and Warburton, {R. J.} and K. Karrai and Petroff, {P. M.}",

year = "2005",

month = may,

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doi = "10.1063/1.1937996",

language = "English",

volume = "86",

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journal = "Applied Physics Letters",

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T1 - Controlled generation of neutral, negatively-charged and positively-charged excitons in the same single quantum dot

AU - Ediger, M.

AU - Dalgarno, P. A.

AU - Smith, J. M.

AU - Gerardot, B. D.

AU - Warburton, R. J.

AU - Karrai, K.

AU - Petroff, P. M.

PY - 2005/5/23

Y1 - 2005/5/23

N2 - We report the controlled generation of neutral, negatively-charged and positively-charged excitons in the same single InAs quantum dot. The control parameters are a vertical electric field applied to a capacitor-like structure, in which the quantum dots are embedded, and optical pump power. The strong Coulomb blockade in quantum dots can be exploited to control the charge of excitons containing one hole, the neutral exciton, X0, and singly negatively charged exciton, X1-. We show here how this concept can be extended to excitons containing two holes, the biexciton, 2 X0, and significantly the singly positively charged exciton, X1+. We support all these assignments with a Coulomb blockade model. For all dots, the emission from the X1- is redshifted relative to the neutral exciton, but surprisingly we observe blueshifts as well as small redshifts for X1+. © 2005 American Institute of Physics.

AB - We report the controlled generation of neutral, negatively-charged and positively-charged excitons in the same single InAs quantum dot. The control parameters are a vertical electric field applied to a capacitor-like structure, in which the quantum dots are embedded, and optical pump power. The strong Coulomb blockade in quantum dots can be exploited to control the charge of excitons containing one hole, the neutral exciton, X0, and singly negatively charged exciton, X1-. We show here how this concept can be extended to excitons containing two holes, the biexciton, 2 X0, and significantly the singly positively charged exciton, X1+. We support all these assignments with a Coulomb blockade model. For all dots, the emission from the X1- is redshifted relative to the neutral exciton, but surprisingly we observe blueshifts as well as small redshifts for X1+. © 2005 American Institute of Physics.

U2 - 10.1063/1.1937996

DO - 10.1063/1.1937996

M3 - Article

SN - 0003-6951

VL - 86

SP - 1

EP - 3

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 21

M1 - 211909

ER -

Controlled generation of neutral, negatively-charged and positively-charged excitons in the same single quantum dot

Abstract

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