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Nuclear spin coherence in a quantum wire

Source: Phys. Rev. B 80, 115326 (2009); doi:10.1103/PhysRevB.80.115326

Published 29 September 2009

KEYWORDS and PACS
Keywords
PACS
  • 76.70.Fz
    Double nuclear magnetic resonance (DNMR) (condensed matter)
  • 73.43.Fj
    Novel experimental methods; measurements (quantum Hall effect)
  • 73.63.Nm
    Quantum wires (electronic transport)
  • 76.60.Es
    Relaxation effects (condensed matter NMR)
  • YEAR: 2009
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PUBLICATION DATA
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A. Córcoles, C. J. B. Ford, M. Pepper, G. A. C. Jones, H. E. Beere, and D. A. Ritchie
Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
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. ©2009 The American Physical Society
History: Received 6 April 2009; revised 31 August 2009; published 29 September 2009
Permalink: http://link.aps.org/abstract/PRB/v80/e115326

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