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.
| Original language | English (US) |
|---|---|
| Article number | 056405 |
| Journal | Physical review letters |
| Volume | 103 |
| Issue number | 5 |
| DOIs | |
| State | Published - Aug 6 2009 |
ASJC Scopus subject areas
- Physics and Astronomy(all)