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Kondo resonances in an Aharonov–Bohm ring with an in‐line quantum dot
Author(s) -
Wu Shaoquan,
Wang Shunjin,
Sun Weili,
Yu Wanlun
Publication year - 2003
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.200301835
Subject(s) - kondo effect , hamiltonian (control theory) , physics , condensed matter physics , slave boson , anderson impurity model , quantum dot , kondo insulator , impurity , ground state , magnetic impurity , electron , parity (physics) , magnetic field , quantum mechanics , persistent current , magnetic flux , quantum , superconductivity , mathematics , mathematical optimization , hubbard model
The properties of the ground state of a closed dot‐ring system with a magnetic flux in the Kondo regime are studied theoretically by means of a one‐impurity Anderson Hamiltonian. The Hamiltonian is solved by means of the slave‐boson mean‐field theory. It is shown that at T = 0, a suppressed Kondo effect exists in this system even when the mean level spacing of electrons in the ring is larger than the bulk Kondo temperature; the physical quantities of this system depend sensitively on both the parity of the system and the size of the ring; the rich physical behavior of this system can attributed to the coexistence of both the finite‐size effect and the Kondo screening effect in this system. It is also possible to detect the Kondo screening cloud by measuring the PC or the zero field impurity susceptibility χ imp directly in future experiments.