The Kondo Effect Enhanced by State Degeneracy(<SPECIAL TOPICS>Kondo Effect-40 Years after the Discovery)

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概要

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• The Kondo effect associated with state degeneracy is studied for a two-dimensional harmonic quantum dot. State degeneracies between a spin singlet and triplet states, between two spin doublet states, and between a spin doublet and quadruplet states are induced by magnetic field. For the first two degenracies, strong enhancement of the Kondo effect is observed. The estimated Kondo temperature for the "doublet-doublet" degeneracy with an odd electron number is similar to that for the "singlet-triplet" degeneracy with an even electron number, indicating that a total of four-fold spin and orbital degeneracy for both cases accounts for the similar enhancement of the Kondo temperature. The Kondo effect generally gives rise to enhanced conductnace and a zero-bias peak of differential conductance in the Coulomb valley. In contrast, enhacned conductance but a zero-bias dip is observed for the third "doublet-quadruplet" degeneracy. This can be due to Zeeman splitting but no clear interpretation is reached yet.

• 一般社団法人日本物理学会の論文
• 2005-01-15

著者

• TARUCHA Seigo

  ERATO, Mesoscopic Correlation Project and Department of Applied Physics, University of Tokyo

• Sasaki Satoshi

  Ntt Basic Research Laboratories

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