Nuclear spin coherence in a quantum wire

Details Nuclear spin coherence in a quantum wire Nuclear spin coherence in a quantum wire

2009-06-22

arxiv.org/abs/0906.3970v2

Phys. Rev. B 80, 115326 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.80.115326

We have observed millisecond-long coherent evolution of nuclear spins in a quantum wire at 1.2 K. Local, all-electrical manipulation of nuclear spins is achieved by dynamic nuclear polarization in the breakdown regime of the Integer Quantum Hall Effect combined with pulsed Nuclear Magnetic Resonance. The excitation thresholds for the breakdown are significantly smaller than what would be expected for our sample and the direction of the nuclear polarization can be controlled by the voltage bias. As a four-level spin system, the device is equivalent to two qubits.

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