- Letter
Direct measurement of spin-flip rates of a self-assembled InAs double quantum dot in single-electron tunneling
Phys. Rev. B 109, L121404 – Published 15 March, 2024
DOI: https://doi.org/10.1103/PhysRevB.109.L121404
Abstract
Spin flips are one of the limiting factors for spin-based information processing. We demonstrate a transport approach for determining the spin-flip rates of a self-assembled InAs double quantum dot occupied by a single electron. In such devices, different Landé factors lead to an inhomogeneous Zeeman splitting, so that the two spin channels can never be at resonance simultaneously, leading to a spin blockade at low temperatures. This blockade is analyzed in terms of spin flips for different temperatures and magnetic fields. Our results are in good agreement with a quantum master equation that combines the dot-lead couplings with ohmic dissipation stemming from spin-flip cotunneling.
