Spin and Polarized Current from Coulomb Blockaded Quantum Dots

R. M. Potok, J. A. Folk, C. M. Marcus, V. Umansky, M. Hanson, and A. C. Gossard
Phys. Rev. Lett. 91, 016802 – Published 3 July 2003

Abstract

We report measurements of spin transitions for GaAs quantum dots in the Coulomb blockade regime and compare ground and excited state transport spectroscopy to direct measurements of the spin polarization of emitted current. Transport spectroscopy reveals both spin-increasing and spin-decreasing transitions, as well as higher-spin ground states, and allows g factors to be measured down to a single electron. The spin of emitted current in the Coulomb blockade regime, measured using spin-sensitive electron focusing, is found to be polarized along the direction of the applied magnetic field regardless of the ground state spin transition.

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  • Received 2 March 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.016802

©2003 American Physical Society

Authors & Affiliations

R. M. Potok1, J. A. Folk1,2, C. M. Marcus1, V. Umansky3, M. Hanson4, and A. C. Gossard4

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA
  • 2Department of Physics, Stanford University, Stanford, California 94305, USA
  • 3Braun Center for Submicron Research, Weizmann Institute of Science, Rehovot, 76100, Israel
  • 4Materials Department, University of California, Santa Barbara, Santa Barbara, California 93106, USA

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Vol. 91, Iss. 1 — 4 July 2003

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