Inhibited recombination of charged magnetoexcitons

H. Okamura; D. Heiman; M. Sundaram; A. C. Gossard

doi:10.1103/PhysRevB.58.R15985

Rapid Communication

Inhibited recombination of charged magnetoexcitons

H. Okamura, D. Heiman, M. Sundaram, and A. C. Gossard

Phys. Rev. B 58, R15985(R) – Published 15 December 1998

Abstract

Time-resolved photoluminescence measurements show that the decay time for charged excitons in a GaAs two-dimensional electron gas increases by an order of magnitude at high magnetic fields. Unlike neutral excitons, the charged exciton center-of-mass is spatially confined in a “magnetically adjustable quantum dot” by the cyclotron orbit and the quantum well. The inhibited recombination is explained by a reduced phase coherence volume of the magnetically confined charged excitons.

Received 30 April 1998

DOI:https://doi.org/10.1103/PhysRevB.58.R15985

Authors & Affiliations

H. Okamura

Physics Department, Kobe University, Kobe 657-8501, Japan;
Physics Department, Northeastern University, Boston, Massachusetts 02115;
Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

D. Heiman

Physics Department, Northeastern University, Boston, Massachusetts 02115
Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

M. Sundaram^* and A. C. Gossard

Materials Department, University of California, Santa Barbara, California 93106

^*Present address: Jet Propulsion Laboratory, Pasadena, CA 91109.

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Vol. 58, Iss. 24 — 15 December 1998

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Physical Review B

covering condensed matter and materials physics