2011
DOI: 10.1103/physrevlett.106.176601
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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 fo… Show more

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Cited by 88 publications
(90 citation statements)
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“…, an enhancement of the current fluctuations is detected out of equilibrium and perfectly explained by an e ective charge induced by the residual interaction between quasi-particles 8, [10][11][12][13][14][15][16][17] . Moreover, an as-yet-unknown scaling law for the e ective charge is discovered, suggesting a new non-equilibrium universality.…”
mentioning
confidence: 66%
See 1 more Smart Citation
“…, an enhancement of the current fluctuations is detected out of equilibrium and perfectly explained by an e ective charge induced by the residual interaction between quasi-particles 8, [10][11][12][13][14][15][16][17] . Moreover, an as-yet-unknown scaling law for the e ective charge is discovered, suggesting a new non-equilibrium universality.…”
mentioning
confidence: 66%
“…This value, closely related to the Wilson ratio, is universal for the Fermi liquid in the Kondo regime as it depends only on the symmetry group of the system [13][14][15] . Although some aspects of Kondo-associated noise have been reported 8,16,17 , a rigorous, selfconsistent treatment in a regime where universal results apply is at the core of the present work. Actually, by investigating the same nanotube quantum dot in the spin degenerate SU(2) Kondo regime and in the spin-orbit degenerate SU(4) regime, the noise is proved to contain distinct signatures of these two symmetries, confirming theoretical developments of Fermi liquid theory out of equilibrium.…”
Section: The Kondo Effectmentioning
confidence: 96%
“…Since this theory is based on the single-particle picture, additional information such as the many-body interaction may be deduced from the precise investigation of the Fano factor combined with the conductance, as we see in the shot noise study in the Kondo regime [19][20][21][22] . Actually, the shot noise of QPC was addressed by several experimental groups; the Pauli exclusion principle was first studied, and then the quantum interference 23 , the 0.7 anomaly [24][25][26] , and the spin polarization 25,27 .…”
Section: Introductionmentioning
confidence: 99%
“…[3][4][5][6][7][8] Specifically, the orbital degeneracy affects the nonequilibrium current and current noise of quantum dots driven by the bias voltage eV , and has recently been studied in the low-energy Fermi-liquid regime.…”
Section: Introductionmentioning
confidence: 99%