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Yoo, Gwangsu; Lee, S.-S. B. und Sim, H.-S. (2018): Detecting Kondo Entanglement by Electron Conductance. In: Physical Review Letters, Bd. 120, Nr. 14, 146801

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Abstract

Quantum entanglement between an impurity spin and electrons nearby is a key property of the single-channel Kondo effects. We show that the entanglement can be detected by measuring electron conductance through a double quantum dot in an orbital Kondo regime. We derive a relation between the entanglement and the conductance, when the SU(2) spin symmetry of the regime is weakly broken. The relation reflects the universal form of many-body states near the Kondo fixed point. Using it, the spatial distribution of the entanglement-hence, the Kondo cloud-can be detected, with breaking of the symmetry spatially nonuniformly by electrical means.

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