Excitons in motion in II-VI semiconductors

James Davies, Lowenna Smith, Daniel Wolverson, V P Kochereshko, J Cibert, H Mariette, H Boukari, M Wiater, G Karczewski, T Wojtowicz, A Gust, C Kruse, D Hommel

Research output: Contribution to journalArticle

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Abstract

We have shown recently that the magnetic properties of excitions change significantly as the excitions acquire kinetic energy. In particular, the excition magnetic moments are enhanced considerably, whilst the diamagnetism decreases. The behaviour can be investigated through spectrascopic studies of excitions confined in quantum wells of large width (greater than five times the excition Bohr radius) and these motion-induced changes in the magnetic properties have now been observed for CdTe, Znse, ZnTe and GaAs. The present paper summarises these phenomena. with particular focus on CdTe and ZnSe, and shows that the changes can be accounted or by motion induced mixing between the excition ground and higher lying states. The mixing is caused by the gamma term in the Luttinger Hamiltonian which describes the dispersion curves for the valence hand and, as a result the form of the excition wavefunction becomes motion dependent. For both materials, excellent agreement is obtained between experiment and the results predicted by this mechanism.
Original languageEnglish
Pages (from-to)1521-1527
Number of pages7
JournalPhysica Status Solidi B-Basic Solid State Physics
Volume247
Issue number6
DOIs
Publication statusPublished - Jun 2010

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Excitons
Magnetic properties
excitons
Diamagnetism
Hamiltonians
Wave functions
Magnetic moments
Kinetic energy
Semiconductor quantum wells
magnetic properties
diamagnetism
magnetic moments
kinetic energy
quantum wells
valence
radii
Experiments
curves
II-VI semiconductors
LDS 751

Keywords

  • excitons
  • photoluminescence
  • II-VI semiconductors

Cite this

Davies, J., Smith, L., Wolverson, D., Kochereshko, V. P., Cibert, J., Mariette, H., ... Hommel, D. (2010). Excitons in motion in II-VI semiconductors. Physica Status Solidi B-Basic Solid State Physics, 247(6), 1521-1527. https://doi.org/10.1002/pssb.200983167

Excitons in motion in II-VI semiconductors. / Davies, James; Smith, Lowenna; Wolverson, Daniel; Kochereshko, V P; Cibert, J; Mariette, H; Boukari, H; Wiater, M; Karczewski, G; Wojtowicz, T; Gust, A; Kruse, C; Hommel, D.

In: Physica Status Solidi B-Basic Solid State Physics, Vol. 247, No. 6, 06.2010, p. 1521-1527.

Research output: Contribution to journalArticle

Davies, J, Smith, L, Wolverson, D, Kochereshko, VP, Cibert, J, Mariette, H, Boukari, H, Wiater, M, Karczewski, G, Wojtowicz, T, Gust, A, Kruse, C & Hommel, D 2010, 'Excitons in motion in II-VI semiconductors', Physica Status Solidi B-Basic Solid State Physics, vol. 247, no. 6, pp. 1521-1527. https://doi.org/10.1002/pssb.200983167
Davies, James ; Smith, Lowenna ; Wolverson, Daniel ; Kochereshko, V P ; Cibert, J ; Mariette, H ; Boukari, H ; Wiater, M ; Karczewski, G ; Wojtowicz, T ; Gust, A ; Kruse, C ; Hommel, D. / Excitons in motion in II-VI semiconductors. In: Physica Status Solidi B-Basic Solid State Physics. 2010 ; Vol. 247, No. 6. pp. 1521-1527.
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