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Appl. Phys. Express 2 (2009) 081101 (3 pages)  |Next Article|  |Table of Contents|
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Bidirectional Current Drag Induced by Two-Electron Cotunneling in Coupled Double Quantum Dots

Gou Shinkai1,2, Toshiaki Hayashi1, Takeshi Ota1, Koji Muraki1, and Toshimasa Fujisawa1,2

1NTT Basic Research Laboratories, NTT Corporation, Atsugi, Kanagawa 243-0198, Japan
2Research Center for Low Temperature Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan

(Received May 13, 2009; accepted June 16, 2009; published online July 24, 2009)

We demonstrate a bidirectional current drag device, in which an electron tunneling through a double-quantum-dot (DQD) drags another electron in the other DQD in the same or opposite direction. The direction can be switched by choosing the corresponding cotunneling process of the two electrons. A reasonable drag effect is experimentally confirmed in a GaAs device. This result encourages optimizing the device for current mirror functions. ©2009 The Japan Society of Applied Physics

URL: http://apex.ipap.jp/link?APEX/2/081101/
DOI: 10.1143/APEX.2.081101


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