Suppression of spin relaxation in an InAs nanowire double quantum dot

Details Suppression of spin relaxation in an InAs nanowire double quantum dot Suppression of spin relaxation in an InAs nanowire double quantum dot

2007-01-03

arxiv.org/abs/cond-mat/0701054v1

Phys. Rev. Lett. 99, 036801 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.99.036801

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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