Anisotropic nuclear-spin diffusion in double quantum wells

T. Hatano, W. Kume, S. Watanabe, K. Akiba, K. Nagase, and Y. Hirayama
Phys. Rev. B 91, 115318 – Published 27 March 2015

Abstract

Nuclear spin diffusion in double quantum wells (QWs) is examined by using dynamic nuclear polarization (DNP) at a Landau level filling factor ν=2/3 spin phase transition (SPT). The longitudinal resistance increases during the DNP of one of the two QW (the “polarization QW”) by means of a large applied current and starts to decrease just after the termination of the DNP. On the other hand, the longitudinal resistance of the other QW (the “detection QW”) continuously increases for approximately 2 h after the termination of the DNP of the polarization QW. It is therefore concluded that the nuclear spins diffuse from the polarization QW to the detection QW. The time evolution of the longitudinal resistance of the polarization QW is explained mainly by the nuclear spin diffusion in the in-plane direction. In contrast, that of the detection QW manifests much slower nuclear diffusion in the perpendicular direction through the AlGaAs barrier.

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  • Received 17 April 2014
  • Revised 10 March 2015

DOI:https://doi.org/10.1103/PhysRevB.91.115318

©2015 American Physical Society

Authors & Affiliations

T. Hatano1,2,*, W. Kume1,†, S. Watanabe2,‡, K. Akiba1,2,§, K. Nagase1,2, and Y. Hirayama1,2,3,∥

  • 1Department of Physics, Tohoku University, Sendai 980-8578, Japan
  • 2JST, ERATO, Nuclear Spin Electronics Project, Sendai 980-8578, Japan
  • 3WPI-AIMR, Tohoku University, Sendai 980- 8577, Japan

  • *hatano@m.tohoku.ac.jp
  • Present address: Tokyo Electron America Inc., 20175 NW Amberglen Court Suite 140, Beaverton, OR 97006 USA.
  • Present address: Bio-AFM Frontier Research Center, Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
  • §Present address: Department of Applied Physics, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.
  • hirayama@m.tohoku.ac.jp

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Vol. 91, Iss. 11 — 15 March 2015

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