Evolution of the Kondo Effect in a Quantum Dot Probed by Shot Noise

Yoshiaki Yamauchi, Koji Sekiguchi, Kensaku Chida, Tomonori Arakawa, Shuji Nakamura, Kensuke Kobayashi, Teruo Ono, Tatsuya Fujii, and Rui Sakano
Phys. Rev. Lett. 106, 176601 – Published 26 April 2011

Abstract

We measure the current and shot noise in a quantum dot in the Kondo regime to address the nonequilibrium properties of the Kondo effect. By systematically tuning the temperature and gate voltages to define the level positions in the quantum dot, we observe an enhancement of the shot noise as temperature decreases below the Kondo temperature, which indicates that the two-particle scattering process grows as the Kondo state evolves. Below the Kondo temperature, the Fano factor defined at finite temperature is found to exceed the expected value of unity from the noninteracting model, reaching 1.8±0.2.

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  • Received 11 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.176601

© 2011 American Physical Society

Authors & Affiliations

Yoshiaki Yamauchi1, Koji Sekiguchi1, Kensaku Chida1, Tomonori Arakawa1, Shuji Nakamura1, Kensuke Kobayashi1,*, Teruo Ono1, Tatsuya Fujii2, and Rui Sakano3

  • 1Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
  • 2Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 3Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan

  • *kensuke@scl.kyoto-u.ac.jp

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Issue

Vol. 106, Iss. 17 — 29 April 2011

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