Well-defined quasiparticles in interacting metallic grains
Strongly Correlated Electrons
2009-11-10 v1 Mesoscale and Nanoscale Physics
Abstract
We analyze spectral functions of mesoscopic systems with large dimensionless conductance, which can be described by a universal Hamiltonian. We show that an important class of spectral functions are dominated by one single state only, which implies the existence of well-defined (i.e. infinite-lifetime) quasiparticles. Furthermore, the dominance of a single state enables us to calculate zero-temperature spectral functions with high accuracy using the density-matrix renormalization group. We illustrate the use of this method by calculating the tunneling density of states of metallic grains and the magnetic response of mesoscopic rings.
Cite
@article{arxiv.cond-mat/0404614,
title = {Well-defined quasiparticles in interacting metallic grains},
author = {Dominique Gobert and Moshe Schechter and Ulrich Schollwock and Jan von Delft},
journal= {arXiv preprint arXiv:cond-mat/0404614},
year = {2009}
}
Comments
4 pages, 3 figures