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- W2052615184 abstract "The Kondo effect in a quantum dot is discussed. In the standard Coulomb blockade setting, tunneling between the dot and the leads is weak, the number of electrons in the dot is well-defined and discrete; the Kondo effect may be considered in the framework of the conventional one-level Anderson impurity model. It turns out however, that the Kondo temperature T K in the case of weak tunneling is extremely low. In the opposite case of almost reflectionless single-mode junctions connecting the dot to the leads, the average charge of the dot is not discrete. Surprisingly, its spin may remain quantized: s=1/2 or s=0, depending (periodically) on the gate voltage. Such a spin-charge separation occurs because, unlike an Anderson impurity, a quantum dot carries a broad-band, dense spectrum of discrete levels. In the doublet state, the Kondo effect develops with a significantly enhanced T K . Like in the weak-tunneling regime, the enhanced T K exhibits strong mesoscopic fluctuations. The statistics of the fluctuations is universal, and related to the Porter-Thomas statistics of the wave function fluctuations." @default.
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- W2052615184 date "2001-05-10" @default.
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- W2052615184 title "KONDO EFFECT AND SPIN-CHARGE SEPARATION IN QUANTUM DOTS" @default.
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- W2052615184 doi "https://doi.org/10.1142/s0217979201005921" @default.
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