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Diamagnetic shift as a measure of the penetration of a quasi-two-dimensional exciton into quantum-well barriers

K. Oettinger, Al. L. Efros, B. K. Meyer, C. Woelk, and H. Brugger
Phys. Rev. B 52, R5531(R) – Published 15 August 1995
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Abstract

The diamagnetic shift of the exciton recombination in InxGa1xAs/GaAs quantum wells goes through a minimum for a well thickness of 40 Å and increases for a thickness of 20 Å. We develop a theory of the exciton diamagnetic shift for intermediate and high fields (5–12 T) that takes into account the three-dimensional electron-hole Coulomb interaction. The theory shows a sensitivity of the diamagnetic shift to the quasi-two-dimensional exciton thickness and describes the experimentally found minimum in the diamagnetic shift. The exciton binding energy as a function of quantum-well thickness is also obtained. A correction term to the average distance of electrons and holes, which takes into account the underestimated theoretical penetration of electron and hole wave functions into the barrier, produces a close agreement with the experimental data.

  • Received 6 June 1995

DOI:https://doi.org/10.1103/PhysRevB.52.R5531

©1995 American Physical Society

Authors & Affiliations

K. Oettinger, Al. L. Efros, and B. K. Meyer

  • Physikdepartment E16, Technische Universität München, D-85747 Garching, Germany

C. Woelk and H. Brugger

  • Daimler-Benz AG, Research Center Ulm, P.O. Box 2360, D-89013 Ulm, Germany

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Issue

Vol. 52, Iss. 8 — 15 August 1995

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