Optical properties of single charge tuneable InGaAs quantum dots

A. D. Ashmore; J. J. Finley; R. Oulton; P. W. Fry; A. Lematre; D. J. Mowbray; M. S. Skolnick; M. Hopkinson; P. D. Buckle; P. A. Maksym

doi:10.1016/S1386-9477(01)00502-1

Optical properties of single charge tuneable InGaAs quantum dots

A. D. Ashmore, J. J. Finley, R. Oulton, P. W. Fry, A. Lematre, D. J. Mowbray, M. S. Skolnick, M. Hopkinson, P. D. Buckle, P. A. Maksym

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

11 Scopus citations

Abstract

We present a magneto-optical investigation of neutral and charged few-exciton complexes in individual In_0.5Ga_0.5As self-assembled quantum dots. The results reveal direct information regarding Coulomb interaction and correlation effects in dots containing a controlled number of excess electrons (N_e = 0,1,2,3,4) or holes (N_h = 0,1,2). Either red or blue shifts of the emission energy are observed as the dot is loaded with excess electrons or holes, respectively. These observations are discussed in terms of the expected nature of the few-particle wave functions. In addition complementary magneto-optical measurements have been performed for negatively charged dots. With increasing N_e a weak increase of the g-factor and a strong reduction of the diamagnetic shift is observed. A pronounced minimum of the diamagnetic shift occurs for N_e = 3.

Original language	English
Pages (from-to)	127-130
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	13
Issue number	2-4
DOIs	https://doi.org/10.1016/S1386-9477(01)00502-1
State	Published - Mar 2002
Externally published	Yes

Keywords

Charged and neutral excitons
Collective phenomena
Self-assembled quantum dots

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10.1016/S1386-9477(01)00502-1

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title = "Optical properties of single charge tuneable InGaAs quantum dots",

abstract = "We present a magneto-optical investigation of neutral and charged few-exciton complexes in individual In0.5Ga0.5As self-assembled quantum dots. The results reveal direct information regarding Coulomb interaction and correlation effects in dots containing a controlled number of excess electrons (Ne = 0,1,2,3,4) or holes (Nh = 0,1,2). Either red or blue shifts of the emission energy are observed as the dot is loaded with excess electrons or holes, respectively. These observations are discussed in terms of the expected nature of the few-particle wave functions. In addition complementary magneto-optical measurements have been performed for negatively charged dots. With increasing Ne a weak increase of the g-factor and a strong reduction of the diamagnetic shift is observed. A pronounced minimum of the diamagnetic shift occurs for Ne = 3.",

keywords = "Charged and neutral excitons, Collective phenomena, Self-assembled quantum dots",

author = "Ashmore, {A. D.} and Finley, {J. J.} and R. Oulton and Fry, {P. W.} and A. Lematre and Mowbray, {D. J.} and Skolnick, {M. S.} and M. Hopkinson and Buckle, {P. D.} and Maksym, {P. A.}",

year = "2002",

month = mar,

doi = "10.1016/S1386-9477(01)00502-1",

language = "English",

volume = "13",

pages = "127--130",

journal = "Physica E: Low-Dimensional Systems and Nanostructures",

issn = "1386-9477",

publisher = "Elsevier B.V.",

number = "2-4",

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TY - JOUR

T1 - Optical properties of single charge tuneable InGaAs quantum dots

AU - Ashmore, A. D.

AU - Finley, J. J.

AU - Oulton, R.

AU - Fry, P. W.

AU - Lematre, A.

AU - Mowbray, D. J.

AU - Skolnick, M. S.

AU - Hopkinson, M.

AU - Buckle, P. D.

AU - Maksym, P. A.

PY - 2002/3

Y1 - 2002/3

N2 - We present a magneto-optical investigation of neutral and charged few-exciton complexes in individual In0.5Ga0.5As self-assembled quantum dots. The results reveal direct information regarding Coulomb interaction and correlation effects in dots containing a controlled number of excess electrons (Ne = 0,1,2,3,4) or holes (Nh = 0,1,2). Either red or blue shifts of the emission energy are observed as the dot is loaded with excess electrons or holes, respectively. These observations are discussed in terms of the expected nature of the few-particle wave functions. In addition complementary magneto-optical measurements have been performed for negatively charged dots. With increasing Ne a weak increase of the g-factor and a strong reduction of the diamagnetic shift is observed. A pronounced minimum of the diamagnetic shift occurs for Ne = 3.

AB - We present a magneto-optical investigation of neutral and charged few-exciton complexes in individual In0.5Ga0.5As self-assembled quantum dots. The results reveal direct information regarding Coulomb interaction and correlation effects in dots containing a controlled number of excess electrons (Ne = 0,1,2,3,4) or holes (Nh = 0,1,2). Either red or blue shifts of the emission energy are observed as the dot is loaded with excess electrons or holes, respectively. These observations are discussed in terms of the expected nature of the few-particle wave functions. In addition complementary magneto-optical measurements have been performed for negatively charged dots. With increasing Ne a weak increase of the g-factor and a strong reduction of the diamagnetic shift is observed. A pronounced minimum of the diamagnetic shift occurs for Ne = 3.

KW - Charged and neutral excitons

KW - Collective phenomena

KW - Self-assembled quantum dots

UR - http://www.scopus.com/inward/record.url?scp=0036493037&partnerID=8YFLogxK

U2 - 10.1016/S1386-9477(01)00502-1

DO - 10.1016/S1386-9477(01)00502-1

M3 - Article

AN - SCOPUS:0036493037

SN - 1386-9477

VL - 13

SP - 127

EP - 130

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 2-4

ER -

Optical properties of single charge tuneable InGaAs quantum dots

Abstract

Keywords

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