On the Suppression of Electron-Hole Exchange Interaction in a Reservoir of Nonradiative Excitons

A. V. Trifonov, I. V. Ignatiev, K. V. Kavokin, A. V. Kavokin, P. Yu. Shapochkin, Yu P. Efimov, S. A. Eliseev, V. A. Lovtcius

Research output


Mechanisms of the suppression of the electron-hole exchange interaction in nonradiative excitons with a large in-plane wave vector in high-quality heterostructures with quantum wells are analyzed theoretically. It is shown that the dominant suppression mechanism is exciton-exciton scattering accompanied by the mutual spin flips of like carriers (either two electrons or two holes), comprising the excitons. As a result, the electron spin polarization in nonradiative excitons may be retained for a long time. The analysis of experimental data shows that this relaxation time can exceed one nanosecond. This long-term and optically controllable spin memory in an exciton reservoir may be of interest for future information technologies.

Original languageEnglish
Pages (from-to)1170-1174
Issue number9
Early online date3 Sep 2019
Publication statusPublished - Sep 2019


Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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