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Published Online July 25, 2002
Science DOI: 10.1126/science.1070958

Reports

Submitted on February 16, 2002
Accepted on July 15, 2002

Current Rectification by Pauli Exclusion in a Weakly Coupled Double Quantum Dot System

K. Ono 1, D. G. Austing 2, Y. Tokura 3, S. Tarucha 4*

1 Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
2 NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan; Institute for Microstructural Sciences M23A, National Research Council of Canada, Ottawa, Ontario, K1A 0R6, Canada.
3 NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan.
4 Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; NTT Basic Research Laboratories, NTT Corporation, Atsugi-shi, Kanagawa 243-0198, Japan; ERATO Mesoscopic Correlation Project, JST, Atsugi-shi, Kanagawa 243-0198, Japan.

* To whom correspondence should be addressed. E-mail: tarucha{at}phys.s.u-tokyo.ac.jp.

We observe spin blockade due to Pauli exclusion in the tunneling characteristics of a coupled quantum dot system when two same spin electrons occupy the lowest energy state in each dot. Spin blockade only occurs in one bias direction when there is asymmetry in the electron population of the two dots, leading to current rectification. We induce the collapse of the spin blockade by applying a magnetic field to open up a new spin-triplet current carrying channel.


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