Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2003-02-24
Phys. Rev. Lett. 91, 258301 (2003)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
related papers available at http://marcuslab.harvard.edu
Scientific paper
10.1103/PhysRevLett.91.258301
We demonstrate the operation of a quantum spin pump based on cyclic radio-frequency excitation of a GaAs quantum dot, including the ability to pump pure spin without pumping charge. The device takes advantage of bidirectional mesoscopic fluctuations of pumped current, made spin-dependent by the application of an in-plane Zeeman field. Spin currents are measured by placing the pump in a focusing geometry with a spin-selective collector.
Marcus Charles M.
Potok R. M.
Umansky Vladimir
Watson Susan K.
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