Atomistic theory of spin relaxation in self-assembled In$ {1-x}$Ga$ x$As-GaAs quantum dots at zero magnetic field - Condensed Matter > Materials ScienceReportar como inadecuado




Atomistic theory of spin relaxation in self-assembled In$ {1-x}$Ga$ x$As-GaAs quantum dots at zero magnetic field - Condensed Matter > Materials Science - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We present full atomistic calculations of the spin-flip time T$ {1}$ ofelectrons and holes mediated by acoustic phonons in self-assembledIn$ {1-x}$Ga$ x$As-GaAs quantum dots at zero magnetic field. At low magneticfield, the first-order process is suppressed, and the second-order processbecomes dominant. We find that the spin-phonon-interaction induced spinrelaxation time is 40 - 80 s for electrons, and 1 - 20 ms for holes at 4.2 K.The calculated hole-spin relaxation times are in good agreement with recentexperiments, which suggests that the two-phonon process is the main relaxationmechanism for hole-spin relaxation in the self-assembled quantum dots at zerofield. We further clarify the structural and alloy composition effects on thespin relaxation in the quantum dots.



Autor: Hai Wei, Ming Gong, G-C Guo, Lixin He

Fuente: https://arxiv.org/







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