Anomalous Kondo Effect in a Quantum Dot at Nonzero Bias

F. Simmel; R. H. Blick; J. P. Kotthaus; W. Wegscheider; M. Bichler

doi:10.1103/PhysRevLett.83.804

Anomalous Kondo Effect in a Quantum Dot at Nonzero Bias

F. Simmel, R. H. Blick, J. P. Kotthaus, W. Wegscheider, and M. Bichler

Phys. Rev. Lett. 83, 804 – Published 26 July 1999

Abstract

We present measurements on the Kondo effect in a small quantum dot connected strongly to one lead and weakly to the other. The conductance of the dot reveals an offset of the Kondo resonance at zero magnetic field. While the resonance persists in the negative bias regime, it is suppressed in the opposite direction. This demonstrates the pinning of the Kondo resonance to the Fermi levels of the leads.

Received 1 December 1998

DOI:https://doi.org/10.1103/PhysRevLett.83.804

Authors & Affiliations

F. Simmel¹, R. H. Blick¹, J. P. Kotthaus¹, W. Wegscheider^2,*, and M. Bichler²

¹Center for NanoScience and Sektion Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, 80539 München, Germany
²Walter-Schottky-Institut der Technischen Universität München, Am Coulombwall, 85748 München, Germany