Kondo Temperature in Multilevel Quantum Dots

Abstract

We develop a general method to evaluate the Kondo temperature in a multilevel quantum dot that is weakly coupled to conducting leads. Our theory reveals that the Kondo temperature is strongly enhanced when the intradot energy-level spacing is comparable to or smaller than the charging energy. We propose an experiment to test our result, which consists of measuring the size-dependence of the Kondo temperature.Comment: 4 pages, 1 figure and supplementary material. Revised and improved version, to appear in Phys. Rev. Let