Phys. Rev. B 72, 233204 (2005) [4 pages]Current-induced dynamic nuclear polarization in GaAsReceived 26 July 2005; revised 4 November 2005; published 29 December 2005 Dynamic nuclear polarization (DNP) induced by an electric current has been investigated in bulk, just-insulating GaAs under nonlinear transport conditions at temperatures between 2 and 10 K using current densities of up to 3 A∕cm2. Under conditions of hot electron transport, negative induced nuclear polarizations are found. The magnitude of current-induced DNP is much smaller than that of optically induced DNP in GaAs. No current-induced DNP effects were found in a just-metallic GaAs sample for which conduction was Ohmic. A model involving nuclear hyperfine interaction with conduction electrons is used to discuss the results. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.233204
DOI:
10.1103/PhysRevB.72.233204
PACS:
72.25.Pn, 76.60.−k
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