Out-of-equilibrium Kondo effect in a mesoscopic device |
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Authors: | De Franceschi S Hanson R Van Der Wiel W G Elzerman J M Wijpkema J J Fujisawa T Tarucha S Kouwenhoven L P |
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Institution: | Department of NanoScience, DIMES, and ERATO Mesoscopic Correlation Project, Delft University of Technology, P.O. Box 5046, The Netherlands. |
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Abstract: | We study the nonequilibrium regime of the Kondo effect in a quantum dot laterally coupled to a narrow wire. We observe a split Kondo resonance when a finite bias voltage is imposed across the wire. The splitting is attributed to the creation of a double-step Fermi distribution function in the wire. Kondo correlations are strongly suppressed when the voltage across the wire exceeds the Kondo temperature. A perpendicular magnetic field enables us to selectively control the coupling between the dot and the two Fermi seas in the wire. Already at fields of order 0.1 T only the Kondo resonance associated with the strongly coupled reservoir survives. |
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