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We investigated electron spin relaxation time τₛ in GaAs/AlGaAs (110) quantum wells (QWs), in which a predominant spin scattering mechanism [D'yakonov-Perel' (DP) mechanism] for conventional (100) QWs is substantially suppressed; τₛ in (110) QWs was of nanosecond order at room temperature, more than an order of magnitude longer than that of the (100) counterpart. The mechanism responsible for the spin relaxation was examined by studying the quantized energy, electron mobility, and temperature dependences of τₛ. The results suggest that in the absence of DP interaction, electron-hole exchange interaction limits τₛ in a wide temperature range ( ~0--300K).
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Ohno et al. (1999) studied this question.
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