Electron-spin beat susceptibility of excitons in semiconductor quantum wells

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

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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. © 2009 The American Physical Society.

Original languageEnglish
Article number056405
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 6 Aug 2009


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