Magneto-photoluminescence studies of Zn1 - xMnxTe/ZnTe multiple quantum-well and quantum-dot structures

Ivan J. Griffin; Peter J. Klar; Daniel Wolverson; J. John Davies; Bernard Lunn; Duncan E. Ashenford; Torsten Henning

Magneto-photoluminescence studies of Zn_{1 - x}Mn_xTe/ZnTe multiple quantum-well and quantum-dot structures

Ivan J. Griffin
, Peter J. Klar
, Daniel Wolverson
, J. John Davies
, Bernard Lunn
, Duncan E. Ashenford
, Torsten Henning

University of East Anglia
University of Hull
Goteborg University

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

1 Citation (SciVal)

Abstract

Wide quantum dots were fabricated from multiple quantum-well (MQW) structures based on Zn_1-xMn_xTe/ZnTe (x = 0.076) dilute magnetic semiconductors and were investigated via photoluminescence (PL) in a magnetic field. Calculations taking into account the strain in the two types of structure enabled the PL transitions to be identified and show that the dominant emission in the MQWs is from heavy-hole (hh) excitons whereas in the quantum dots, the removal of the strain in the barrier layers generates a large biaxial tensile strain in the quantum wells which shifts the light-hole (lh) exciton to lower energy than the hh exciton. The lh exciton σ⁺ transition is virtually independent of magnetic field whilst the hh exciton is field-dependent. Thus, at fields of 1-2 T, the hh exciton σ⁺ transition again becomes the lowest-energy transition of the quantum dots. These observations are described by a model with a chemical valence band offset of 30% for Zn_1-xMn_xTe/ZnTe.

Original language	English
Pages (from-to)	325-329
Number of pages	5
Journal	Journal of Crystal Growth
Volume	184-185
Publication status	Published - 1 Jan 1998

Funding

I.J.G. and P.J.K. thank EPSRC (UK) and UEA-Norwich, respectively, for research studentships. The work was supported by EPSRC under Grants GR/H57356, GR/H93774 and GRJK04589. We are also grateful to the Swedish Nanometer Laboratory for the use of their facilities.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Dilute magnetic semiconductor
Magneto-photoluminescence
Nano-fabrication
Quantum dot
Zinc manganese telluride

ASJC Scopus subject areas

Condensed Matter Physics
Inorganic Chemistry
Materials Chemistry

Cite this

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title = "Magneto-photoluminescence studies of Zn1 - xMnxTe/ZnTe multiple quantum-well and quantum-dot structures",

abstract = "Wide quantum dots were fabricated from multiple quantum-well (MQW) structures based on Zn1-xMnxTe/ZnTe (x = 0.076) dilute magnetic semiconductors and were investigated via photoluminescence (PL) in a magnetic field. Calculations taking into account the strain in the two types of structure enabled the PL transitions to be identified and show that the dominant emission in the MQWs is from heavy-hole (hh) excitons whereas in the quantum dots, the removal of the strain in the barrier layers generates a large biaxial tensile strain in the quantum wells which shifts the light-hole (lh) exciton to lower energy than the hh exciton. The lh exciton σ+ transition is virtually independent of magnetic field whilst the hh exciton is field-dependent. Thus, at fields of 1-2 T, the hh exciton σ+ transition again becomes the lowest-energy transition of the quantum dots. These observations are described by a model with a chemical valence band offset of 30\% for Zn1-xMnxTe/ZnTe.",

keywords = "Dilute magnetic semiconductor, Magneto-photoluminescence, Nano-fabrication, Quantum dot, Zinc manganese telluride",

author = "Griffin, \{Ivan J.\} and Klar, \{Peter J.\} and Daniel Wolverson and Davies, \{J. John\} and Bernard Lunn and Ashenford, \{Duncan E.\} and Torsten Henning",

year = "1998",

month = jan,

day = "1",

language = "English",

volume = "184-185",

pages = "325--329",

journal = "Journal of Crystal Growth",

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T1 - Magneto-photoluminescence studies of Zn1 - xMnxTe/ZnTe multiple quantum-well and quantum-dot structures

AU - Griffin, Ivan J.

AU - Klar, Peter J.

AU - Wolverson, Daniel

AU - Davies, J. John

AU - Lunn, Bernard

AU - Ashenford, Duncan E.

AU - Henning, Torsten

PY - 1998/1/1

Y1 - 1998/1/1

N2 - Wide quantum dots were fabricated from multiple quantum-well (MQW) structures based on Zn1-xMnxTe/ZnTe (x = 0.076) dilute magnetic semiconductors and were investigated via photoluminescence (PL) in a magnetic field. Calculations taking into account the strain in the two types of structure enabled the PL transitions to be identified and show that the dominant emission in the MQWs is from heavy-hole (hh) excitons whereas in the quantum dots, the removal of the strain in the barrier layers generates a large biaxial tensile strain in the quantum wells which shifts the light-hole (lh) exciton to lower energy than the hh exciton. The lh exciton σ+ transition is virtually independent of magnetic field whilst the hh exciton is field-dependent. Thus, at fields of 1-2 T, the hh exciton σ+ transition again becomes the lowest-energy transition of the quantum dots. These observations are described by a model with a chemical valence band offset of 30% for Zn1-xMnxTe/ZnTe.

AB - Wide quantum dots were fabricated from multiple quantum-well (MQW) structures based on Zn1-xMnxTe/ZnTe (x = 0.076) dilute magnetic semiconductors and were investigated via photoluminescence (PL) in a magnetic field. Calculations taking into account the strain in the two types of structure enabled the PL transitions to be identified and show that the dominant emission in the MQWs is from heavy-hole (hh) excitons whereas in the quantum dots, the removal of the strain in the barrier layers generates a large biaxial tensile strain in the quantum wells which shifts the light-hole (lh) exciton to lower energy than the hh exciton. The lh exciton σ+ transition is virtually independent of magnetic field whilst the hh exciton is field-dependent. Thus, at fields of 1-2 T, the hh exciton σ+ transition again becomes the lowest-energy transition of the quantum dots. These observations are described by a model with a chemical valence band offset of 30% for Zn1-xMnxTe/ZnTe.

KW - Dilute magnetic semiconductor

KW - Magneto-photoluminescence

KW - Nano-fabrication

KW - Quantum dot

KW - Zinc manganese telluride

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SN - 0022-0248

VL - 184-185

SP - 325

EP - 329

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JF - Journal of Crystal Growth

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