Experimental Realization of a Quantum Spin Pump

Susan K. Watson, R. M. Potok, C. M. Marcus, and V. Umansky
Phys. Rev. Lett. 91, 258301 – Published 18 December 2003

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.

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  • Received 1 June 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.258301

©2003 American Physical Society

Authors & Affiliations

Susan K. Watson1,2, R. M. Potok2, C. M. Marcus2, and V. Umansky3

  • 1Department of Physics, Middlebury College, Middlebury, Vermont 05753, USA
  • 2Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 3Braun Center for Submicron Research, Weizmann Institute of Science, Rehovot 76100, Israel

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Issue

Vol. 91, Iss. 25 — 19 December 2003

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