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Single-Spin Readout in a Double Quantum Dot Including a Micromagnet

Source: Phys. Rev. Lett. 104, 046802 (2010); doi:10.1103/PhysRevLett.104.046802

Published 28 January 2010

PACS
  • 73.23.-b
    Electronic transport in mesoscopic systems
  • 03.67.Lx
    Quantum computation architectures and implementations
  • 73.63.Kv
    Quantum dots (electronic transport)
  • YEAR: 2010
PUBLICATION DATA
Publisher:
AIP is a member of CrossRef APS
Yun-Sok Shin,1 Toshiaki Obata,1 Yasuhiro Tokura,1,2 Michel Pioro-Ladrière,1 Roland Brunner,1 Toshihiro Kubo,1 Katsuharu Yoshida,1 and Seigo Tarucha1,3,4
1Quantum Spin Information Project, ICORP, JST, Atsugi-shi, Kanagawa 243-0198, Japan
2NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan
3Institute for Nano Quantum Information Electronics, The University of Tokyo, Komaba, Meguro-ku, Tokyo, Japan
4QPEC and Department of Applied Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
We use photon-assisted tunneling (PAT) and an inhomogeneous Zeeman field to demonstrate spin-selective PAT readout with a double quantum dot. The inhomogeneous Zeeman field is generated by a proximal micromagnet, which provides different stray fields between the two dots, resulting in an energy difference between the interdot PAT of the up-spin state and that of the down-spin state. We apply various external magnetic fields to modify the relative filling weight between the up-spin and down-spin states and detect it by using a charge detection technique to probe the PAT induced charge delocalization in the double dot. ©2010 The American Physical Society
History: Received 27 October 2009; published 28 January 2010
Permalink: http://link.aps.org/abstract/PRL/v104/e046802
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