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APS » Journals » Phys. Rev. B » Volume 48 » Issue 24
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Phys. Rev. B 48, 18010–18015 (1993)

Observation of many-body effects and band-gap renormalization in low-dimensional systems with built-in piezoelectric fields

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Karen J. Moore
Department of Mathematics and Physics, The Manchester Metropolitan University, John Dalton Building, Chester Street, Manchester M1 5GD, United Kingdom

Philippe Boring and Bernard Gil
Université de Montpellier II, Groupe d’Etudes des Semiconducteurs, Case Courrier 074, 34095 Montpellier Cedex 5, France

Karl Woodbridge
Department of Electronic and Electrical Engineering, University College London, London WC1E 7JE, United Kingdom

Received 12 July 1993; published in the issue dated 15 December 1993

We show that many-body effects and band-gap renormalization can be easily produced in strained-layer quantum wells with internal built-in piezoelectric fields, under photoexcitation. Our observation was made at low temperature by comparing the behavior of Ga0.92In0.08As-GaAs strained-layer quantum wells grown along the (111) and (001) directions and tuning the densities of photoinjected carriers over several decades. Comparison between experimental data and the results of Hartree calculations including the charge space effects reveals that many-body interactions are photoinduced.

© 1993 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.48.18010
DOI:
10.1103/PhysRevB.48.18010
PACS:
73.20.Dx, 71.55.Eq, 77.90.+k, 78.55.Cr
 
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