Resolving the nonequilibrium Kondo singlet in energy- and position-space using quantum measurements

Erpenbeck, André; Cohen, Guy

doi:10.48550/arxiv.2012.13327

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2021

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“…These studies have revealed various signatures of the Kondo cloud, but did not reveal a spatial structure fully consistent with theoretical predictions. We also note in passing that spin-spin correlations do not necessarily imply a singlet state, and that more stringent (if also complicated) measurements have been proposed [15].…”

Section: Introductionmentioning

confidence: 96%

The Kondo Cloud in a 1D Nanowire

Kleinhenz¹,

Krivenko²,

Cohen³

et al. 2021

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A recent experiment [Nature 579, 210-213 (2020)] probed the extent of the Kondo cloud in 1D by measuring the effect of electrostatic perturbations applied a distance L away from the impurity on TK . We study the Kondo cloud in a model proposed to describe this experimental setup, consisting of a single impurity Anderson model coupled to two semi-infinite 1D leads. In agreement with the experimental results, we find that TK is strongly affected by perturbations to the lead within the Kondo cloud. We obtain a complementary picture of the Kondo cloud in this system by observing how the Kondo state manifests itself in the local density of states of the leads, which may be observed experimentally via scanning tunneling microscopy. Our results support the existing experimental data and provide detailed predictions for future experiments seeking to characterize the Kondo cloud in this system.

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Section: Introductionmentioning

confidence: 96%