Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei

• URL: http://arxiv.org/abs/2012.07227v2
• Date: Thu, 17 Dec 2020 15:21:00 GMT
• Title: Driven dynamics of a quantum dot electron spin coupled to bath of higher-spin nuclei
• Authors: Arian Vezvaee, Girish Sharma, Sophia E. Economou, and Edwin Barnes
• Abstract summary: We study the interplay of optical driving and hyperfine interaction between an electron confined in a quantum dot and its surrounding nuclear spin environment. We find that while hyperfine interactions drive dynamic nuclear polarization and mode-locking, quadrupolar couplings counteract these effects.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The interplay of optical driving and hyperfine interaction between an electron confined in a quantum dot and its surrounding nuclear spin environment produces a range of interesting physics such as mode-locking. In this work, we go beyond the ubiquitous spin 1/2 approximation for nuclear spins and present a comprehensive theoretical framework for an optically driven electron spin in a self-assembled quantum dot coupled to a nuclear spin bath of arbitrary spin. Using a dynamical mean-field approach, we compute the nuclear spin polarization distribution with and without the quadrupolar coupling. We find that while hyperfine interactions drive dynamic nuclear polarization and mode-locking, quadrupolar couplings counteract these effects. The tension between these mechanisms is imprinted on the steady-state electron spin evolution, providing a way to measure the importance of quadrupolar interactions in a quantum dot. Our results show that higher-spin effects such as quadrupolar interactions can have a significant impact on the generation of dynamic nuclear polarization and how it influences the electron spin evolution.

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