Real-time observation of charge-spin cooperative dynamics driven by a nonequilibrium phonon environment
Abstract
Quantum dots are recognized as a suitable platform for studying thermodynamic phenomena involving single electronic charges and spins in nano-scale devices. However, such a thermodynamic system is usually driven by electron reservoirs at different temperatures, not by a lattice temperature gradient. We report on experimental observations of charge-spin cooperative dynamics in transitions of two-electron spin states in a GaAs double quantum dot located in a non-equilibrium phonon environment. Enhancements in the spin-flip processes are observed, originating from phonon excitation combined with the spin-orbit interaction. In addition, due to the spatial gradient of phonon density between the dots, the spin-flip rate during an inter-dot electron tunnel from a hot to a cold dot is more enhanced than in the other direction, resulting in accumulation of parallel spin states in the double dot.
Keywords
Cite
@article{arxiv.2106.01576,
title = {Real-time observation of charge-spin cooperative dynamics driven by a nonequilibrium phonon environment},
author = {Kazuyuki Kuroyama and Sadashige Matsuo and Jo Muramoto and Shunsuke Yabunaka and Sasha R. Valentin and Arne Ludwig and Andreas D. Wieck and Yasuhiro Tokura and Seigo Tarucha},
journal= {arXiv preprint arXiv:2106.01576},
year = {2022}
}