This article is cited in 5 papers

XXIII International symposium ''Nanophysics and Nanoelectronics'', Nizhny Novgorod, March 11–14, 2019

On the suppression of electron-hole exchange interaction in a reservoir of nonradiative excitons

A. V. Trifonov, I. V. Ignat'ev, K. V. Kavokin, A. V. Kavokin, P. Yu. Shapochkin, Yu. P. Efimov, S. A. Eliseev, V. A. Lovtsyus

Saint Petersburg State University

Abstract: 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.

Keywords: exciton, exchange interaction, quantum well.

Received: 24.04.2019
Revised: 29.04.2019
Accepted: 29.04.2019

DOI: 10.21883/FTP.2019.09.48123.06

 English version: Semiconductors, 2019, 53:9, 1170–1174

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