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Suppression of spin relaxation in an InAs nanowire double quantum dot

A. Pfund·I. Shorubalko·K. Ensslin·R. Leturcq
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Abstract

We investigate the triplet-singlet relaxation in a double quantum dot defined by top-gates in an InAs nanowire. In the Pauli spin blockade regime, the leakage current can be mainly attributed to spin relaxation. While at weak and strong inter-dot coupling relaxation is dominated by two individual mechanisms, the relaxation is strongly reduced at intermediate coupling and finite magnetic field. In addition we observe a charateristic bistability of the spin-non conserving current as a function of magnetic field. We propose a model where these features are explained by the polarization of nuclear spins enabled by the interplay between hyperfine and spin-orbit mediated relaxation.

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A. Pfund, I. Shorubalko, K. Ensslin, R. Leturcq. 2007-01-03. Suppression of spin relaxation in an InAs nanowire double quantum dot. https://doi.org/10.1103/physrevlett.99.036801

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