Level coupled to a onedimensional interacting reservoir: A density matrix renormalization group study
Abstract
The influence of weak interactions in a reservoir coupled to a level on the width of the filling as a function of the chemical potential and the position of the level is studied. The density matrix renormalization group method is used to calculate the ground state of a finitesize interacting reservoir, linked to a single state dot. The influence of the interactions in the lead as well as dotlead interactions is considered. It is found that interactions in the reservoir result in a decrease in the resonance width, while the dotlead interaction has an opposite effect. These effects are explained within the random phase approximation as an effective change in the inverse compressibility of the reservoir, while the dotlead interactions renormalize the position of the level.
 Publication:

Physical Review B
 Pub Date:
 April 2005
 DOI:
 10.1103/PhysRevB.71.153301
 arXiv:
 arXiv:condmat/0410471
 Bibcode:
 2005PhRvB..71o3301S
 Keywords:

 73.23.b;
 71.10.Fd;
 71.10.Pm;
 Electronic transport in mesoscopic systems;
 Lattice fermion models;
 Fermions in reduced dimensions;
 Condensed Matter  Mesoscale and Nanoscale Physics
 EPrint:
 4 pages, 4 figures