title: Evolution of the Kondo effect in a quantum dot probed by shot noise.
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.
authors.affiliation: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Yamauchi
authors.forename: Koji
authors.initials: K
authors.lastname: Sekiguchi
authors.forename: Kensaku
authors.initials: K
authors.lastname: Chida
authors.forename: Tomonori
authors.initials: T
authors.lastname: Arakawa
authors.forename: Shuji
authors.initials: S
authors.lastname: Nakamura
authors.forename: Kensuke
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Teruo
authors.initials: T
authors.lastname: Ono
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Fujii
authors.forename: Rui
authors.initials: R
authors.lastname: Sakano