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.

References in corpus (8)

• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Experimental signature of phonon-mediated spin relaxation
• Semiconductor few-electron quantum dot operated as a bipolar spin filter
• Spin relaxation at the singlet-triplet crossing in a quantum dot
• Quantum interference and phonon-mediated back-action in lateral quantum dot circuits
• Telegraph Noise in Coupled Quantum Dot Circuits Induced by a Quantum Point Contact
• Statistical electron excitation in a double quantum dot induced by two independent quantum point contacts
• Optimal power and efficiency of single quantum dot heat engines: theory and experiment

Cited by in corpus (2)

• Autonomous demon exploiting heat and information at the trajectory level
• Phonon-mediated spin dynamics in a two-electron double quantum dot under a phonon temperature gradient