Nuclear spin induced oscillatory current in spin-blocked quantum dots

Abstract

Hyperfine coupling of electron spins to nuclear spins is studied for a GaAs-based double quantum dot in the spin blockade regime where the electron conduction is mostly blocked by Pauli effect unless the electron spin state in the double dot is changed. A current flowing through the double dot shows time-dependent oscillations with a period of as long as 200 sec in a certain DC magnetic field range. The oscillatory behavior is significantly diminished by application of an AC magnetic field whose frequency can induce nuclear magnetic resonance for 71Ga and 69Ga, respectively. A possible nuclear spin polarization mechanism due to hyperfine flip-flop scattering is proposed.

4 pages, 3 figures

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