Electron-Spin Beat Susceptibility of Excitons in Semiconductor Quantum Wells

N. H. Kwong, Stefan Schumacher, and R. Binder
Phys. Rev. Lett. 103, 056405 – Published 29 July 2009
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Abstract

Recent time-resolved differential transmission and Faraday rotation measurements of long-lived electron-spin coherence in quantum wells displayed intriguing parametric dependencies. For their understanding we formulate a microscopic theory of the optical response of a gas of optically incoherent excitons whose constituent electrons retain spin coherence, under a weak magnetic field applied in the quantum well’s plane. We define a spin beat susceptibility and evaluate it in linear order of the exciton density. Our results explain the many-body physics underlying the basic features observed in the experimental measurements.

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  • Received 13 April 2008

DOI:https://doi.org/10.1103/PhysRevLett.103.056405

©2009 American Physical Society

Authors & Affiliations

N. H. Kwong, Stefan Schumacher*, and R. Binder

  • College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA

  • *Present address: Physics–School of EPS, Heriot-Watt University, Edinburgh EH14 4AS, UK.

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Issue

Vol. 103, Iss. 5 — 31 July 2009

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