Direct evaluation of nuclear spin fluctuation by using nuclear spin switch in single quantum structures

摘要

The nuclear spin fluctuation (NSF) induces a severe electron spin relaxation and is one of the hot issues for various spin-based applications. In this study, we demonstrate the convenient method for the direct evaluation of the NSF by utilizing the nuclear spin switch in single In 0.75Al0.25As/Al0.3Ga0.7As quantum dots and InAs/GaAs quantum rings. Our method uses the photoluminescence signals with time-integrated mode and can be utilized in the individual nanostructures with weak signal intensities. Further, the demonstrated method can be used to determine the sign and magnitude of electron and hole effective g factors, which are the key parameters describing the dynamics of a coupled electron-nuclear spin system. (C) 2019 The Japan Society of Applied Physics