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Kondo effect in a three‐terminal quantum ring
Author(s) -
Leturcq R.,
Schmid L.,
Ensslin K.,
Driscoll D. C.,
Gossard A. C.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642182
Subject(s) - kondo effect , physics , quantum decoherence , ring (chemistry) , kondo insulator , condensed matter physics , measure (data warehouse) , quantum , quantum mechanics , quantum dot , chemistry , computer science , electron , organic chemistry , database
The Kondo effect has been widely studied in semiconductor quantum dots, in particular due to the ability to study the system out‐of‐equilibrium. However, the information obtained from a quantum dot connected to two leads is not complete, and a better understanding of this regime can be achieved by connecting the system to a third lead. We have performed transport measurements on a three‐terminal quantum ring in the Kondo regime. With two leads strongly coupled to the ring, we have used the third weakly coupled lead as a tunnel probe in order to measure the Kondo density of states, and to study the decoherence of the Kondo state at large bias voltage. We also show that the three leads can be strongly coupled and all show a Kondo correlation with the ring, which is the first step towards observing a two‐channel Kondo effect. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)