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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents



  history
ID: 192843.0, MPI für Festkörperforschung / FKF Publikationen 2004
Dynamical 1/N approach to time-dependent currents through quantum dots
Authors:Merino, J.; Marston, J. B.
Language:English
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Physical Review B
Volume:69
Issue / Number:11
Sequence Number of Article:115304
Review Status:not specified
Audience:Not Specified
Abstract / Description:A systematic truncation of the many-body Hilbert space is implemented
to study how electrons in a quantum dot attached to conducting leads
respond to time-dependent biases. The method, which we call the
dynamical 1/N approach, is first tested in the most unfavorable case,
the case of spinless fermions (N=1). We recover the expected behavior,
including transient ringing of the current in response to an abrupt
change of bias. We then apply the approach to the physical case of
spinning electrons, N=2, in the Kondo regime for the case of infinite
intradot Coulomb repulsion. In agreement with previous calculations
based on the noncrossing approximation, we find current oscillations
associated with transitions between Kondo resonances situated at the
Fermi levels of each lead. We show that this behavior persists for a
more realistic model of semiconducting quantum dots in which the
Coulomb repulsion is finite.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:Max Planck Inst Festkorperforsch, D-70506 Stuttgart, Germany.
; Brown Univ, Dept Phys, Providence, RI 02912 USA.
Identifiers:ISI:000220814000078 [ID No:1]
ISSN:1098-0121 [ID No:2]
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