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Journal Articles Physical Review Letters Year : 2016

Electron phase shift at the zero-bias anomaly of quantum point contacts

Ulf Gennser
Pascal Simon
Serge Huant
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Abstract

The Kondo effect is the many-body screening of a local spin by a cloud of electrons at very low temperature. It has been proposed as an explanation of the zero-bias anomaly in quantum point contacts where interactions drive a spontaneous charge localization. However, the Kondo origin of this anomaly remains under debate, and additional experimental evidence is necessary. Here we report on the first phase-sensitive measurement of the zero-bias anomaly in quantum point contacts using a scanning gate microscope to create an electronic interferometer. We observe an abrupt shift of the interference fringes by half a period in the bias range of the zero-bias anomaly, a behavior which cannot be reproduced by single-particle models. We instead relate it to the phase shift experienced by electrons scattering off a Kondo system. Our experiment therefore provides new evidence of this many-body effect in quantum point contacts.
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Dates and versions

hal-01294955 , version 1 (17-04-2024)

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Boris Brun, Frederico Martins, Sebastien Faniel, Benoit Hackens, Antonella Cavanna, et al.. Electron phase shift at the zero-bias anomaly of quantum point contacts. Physical Review Letters, 2016, 116 (13), pp.136801. ⟨10.1103/PhysRevLett.116.136801⟩. ⟨hal-01294955⟩
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