MPI für Festkörperforschung / FKF Publikationen 2004 |
|Dynamical 1/N approach to time-dependent currents through quantum dots|
|Authors:||Merino, J.; Marston, J. B.|
|Date of Publication (YYYY-MM-DD):||2004|
|Title of Journal:||Physical Review B|
|Issue / Number:||11|
|Sequence Number of Article:||115304|
|Review Status:||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|
|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]
The scope and number of records on eDoc is subject
to the collection policies defined by each institute
- see "info" button in the collection browse view.