Probing the Kondo density of states in a three-terminal quantum ring.
- Leturcq R Solid State Physics Laboratory, ETH Zürich, 8093 Zürich, Switzerland. leturcq@phys.ethz.ch
- Schmid L
- Ensslin K
- Meir Y
- Driscoll DC
- Gossard AC
- 2005-10-04
Published in:
- Physical review letters. - 2005
English
We have measured the Kondo effect in a quantum ring connected to three terminals. In this configuration nonlinear transport measurements allow us to check which lead contributes to the Kondo density of states (DOS) and which does not. The ring geometry allows a fine-tuning of the coupling to each lead through the Aharonov-Bohm effect via application of a magnetic field. When the ring is connected to two strongly and one weakly coupled leads, conductance through the weakly coupled lead provides a direct measurement of the DOS in the Kondo regime. By applying a bias between the two strongly coupled leads, we demonstrate directly the splitting of the out-of-equilibrium Kondo DOS.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.95.126603
- PMID 16197095
- Persistent URL
- https://sonar.ch/global/documents/47230
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