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Negative Coulomb drag in coupled wire and quantum dot system |
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| Authors: | Masafumi Shimizu Michihisa Yamamoto Michael Stopa Motonari Honda Seigo Tarucha |
| Institution: | aDepartment of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan;bERATO Mesoscopic Correlation Project, Atsugi-shi, Kanagawa, 243-0198, Japan;cDepartment of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo, 113-0033, Japan |
| Abstract: | We measure the Coulomb drag between parallel split-gate quantum wires with a quantum dot embedded in one of the two wires (drive wire). We observe negative Coulomb drag when a Coulomb oscillation peak appears in the drive wire and the conductance of the other wire (drag wire) is slightly below the first plateau. This indicates that correlation holes are dragged in the drag wire by single electron tunneling through the quantum dot in the drive wire. The drag is only promoted in the drag wire near the barrier regions of the dot, and low compressibility of the drag wire is necessary for the negative drag to occur. |
| Keywords: | Quantum dots Coulomb drag Single electron tunneling |
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