Kondo Effect in a Few-Electron Quantum Ring

U. F. Keyser; C. Fühner; S. Borck; R. J. Haug; M. Bichler; G. Abstreiter; W. Wegscheider

doi:10.1103/PhysRevLett.90.196601

Kondo Effect in a Few-Electron Quantum Ring

U. F. Keyser, C. Fühner, S. Borck, R. J. Haug, M. Bichler, G. Abstreiter, W. Wegscheider

Natural Sciences

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

A small quantum ring with less than ten electrons was studied by transport spectroscopy. For strong coupling to the leads a Kondo effect is observed and used to characterize the spin structure of the system in a wide range of magnetic fields. At small magnetic fields Aharonov-Bohm oscillations influenced by Coulomb interaction appear. They exhibit phase jumps by [Formula presented] at the Coulomb-blockade resonances. Inside Coulomb-blockade valleys the Aharonov-Bohm oscillations can also be studied due to the finite conductance caused by the Kondo effect. Astonishingly, the maxima of the oscillations show linear shifts with increasing magnetic field and gate voltage.

Original language	English
Pages (from-to)	4
Number of pages	1
Journal	Physical Review Letters
Volume	90
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.90.196601
State	Published - 2003

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10.1103/PhysRevLett.90.196601

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AU - Keyser, U. F.

AU - Fühner, C.

AU - Borck, S.

AU - Haug, R. J.

AU - Bichler, M.

AU - Abstreiter, G.

AU - Wegscheider, W.

PY - 2003

Y1 - 2003

N2 - A small quantum ring with less than ten electrons was studied by transport spectroscopy. For strong coupling to the leads a Kondo effect is observed and used to characterize the spin structure of the system in a wide range of magnetic fields. At small magnetic fields Aharonov-Bohm oscillations influenced by Coulomb interaction appear. They exhibit phase jumps by [Formula presented] at the Coulomb-blockade resonances. Inside Coulomb-blockade valleys the Aharonov-Bohm oscillations can also be studied due to the finite conductance caused by the Kondo effect. Astonishingly, the maxima of the oscillations show linear shifts with increasing magnetic field and gate voltage.

AB - A small quantum ring with less than ten electrons was studied by transport spectroscopy. For strong coupling to the leads a Kondo effect is observed and used to characterize the spin structure of the system in a wide range of magnetic fields. At small magnetic fields Aharonov-Bohm oscillations influenced by Coulomb interaction appear. They exhibit phase jumps by [Formula presented] at the Coulomb-blockade resonances. Inside Coulomb-blockade valleys the Aharonov-Bohm oscillations can also be studied due to the finite conductance caused by the Kondo effect. Astonishingly, the maxima of the oscillations show linear shifts with increasing magnetic field and gate voltage.

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DO - 10.1103/PhysRevLett.90.196601

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VL - 90

SP - 4

JO - Physical Review Letters

JF - Physical Review Letters

IS - 19

ER -

Kondo Effect in a Few-Electron Quantum Ring

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