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Mechanisms of suppression of the electron-hole exchange interaction in nonradiative excitons with large in-plane wave vector in high-quality heterostructures with quantum wells are analyzed theoretically. It is shown that the dominating suppression mechanism is the 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 survive for a long time. The analysis of experimental data shows that this relaxation time can exceed one nanosecond. This long and optically controllable spin memory in the exciton reservoir may be of interest for future information technologies. Физика и техника полупроводников, 2019, том 53, вып. 9

Подавление электронно-дырочного обменного взаимодействия в резервуаре неизлучающих экситонов