title: Experimental realization of a quantum spin pump.
abstract: 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.
authors.affiliation: Department of Physics, Middlebury College, Middlebury, Vermont 05753, USA.
authors.forename: Susan K
authors.initials: SK
authors.lastname: Watson
authors.forename: R M
authors.initials: RM
authors.lastname: Potok
authors.forename: C M
authors.initials: CM
authors.lastname: Marcus
authors.forename: V
authors.initials: V
authors.lastname: Umansky