Instituto de Ciencia de Materiales de Madrid
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Direct measurement of spin-flip rates in single-electron tunneling

Olfa Dani, Robert Hussein, Johannes C. Bayer, Klaus Pierz, Sigmund Kohler, and Rolf J. Haug
Phys. Rev. B 109, L121404 (2024)

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.

[ICMM-CSIC] [Condensed Matter Theory]
last modified: 15.3.2024 by Sigmund Kohler