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Conductance of Aharonov–Bohm interferometers embedded with an interacting dot: slave‐boson mean‐field calculation
Author(s) -
Takagaki Y.,
Ploog K. H.
Publication year - 2005
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.200541025
Subject(s) - physics , slave boson , condensed matter physics , oscillation (cell signaling) , aharonov–bohm effect , coulomb , conductance , magnetic field , electron , wave function , boson , phase (matter) , loop (graph theory) , quantum mechanics , superconductivity , chemistry , hubbard model , biochemistry , mathematics , combinatorics
We numerically calculate the conductance of a one‐dimensional Aharonov–Bohm loop containing a weakly coupled dot. The Coulomb repulsion is taken into account in the dot within the slave‐boson mean‐field approximation. We avoid the so‐called phase locking by attaching an additional lead to the loop. The phase of the electron wavefunction deduced from the Aharonov–Bohm oscillation changes gradually by π when the Fermi energy sweeps across a transmission resonance in the dot. The asymmetric lineshape of Fano‐type resonances is also examined. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)