Out-of-equilibrium Kondo Effect in a Three Lead Quantum Dot

I. G. Rau; R. M. Potok; D. Goldhaber-Gordon; H. Shtrikman

Out-of-equilibrium Kondo Effect in a Three Lead Quantum Dot

ORAL

Abstract

We present measurements of a small GaAs quantum dot in a three lead geometry with the third lead used both as a probe of Kondo resonances and wavefunction coupling to the various reservoirs. Kondo correlations produce an enhanced density of states at the Fermi level in each reservoir. We demonstrate that the third lead probes the individual out-of-equilibrium densities of states of the two other leads when a voltage bias is fixed across them. In addition, information about the spatial distribution of quantum dot wavefunctions can be inferred from presence or absence of Coulomb blockade features in the third lead. Research supported by an NSF CARRER award DMR-0349354. RMP acknowledges support from an ARO Graduate Fellowship.

March 21, 2005, 9:12 AM – March 21, 2005, 9:24 AM

Authors

I. G. Rau

Stanford University
R. M. Potok

Harvard University and Stanford University, Stanford University and Harvard University
D. Goldhaber-Gordon

Stanford University, Department of Physics, Stanford University
H. Shtrikman

Weizmann Institute of Science, Department of Condensed Matter Physics, Weizmann Institute of Science, Weizmann Institute