91 citations · 133 across the 6 of their papers we have counts for
6 papers
Density functional theory for a model quantum dot: Beyond the local-density approximation
S. Schenk, P. Schwab, M. Dzierzawa +1
We study both static and transport properties of model quantum dots, employing density functional theory as well as (numerically) exact methods. For the lattice model under conside…
Quantum spin chains with various defects
C. Schuster, U. Eckern
Using the density matrix renormalization group (DMRG) method, we study the quantum coherence in one-dimensional disordered Fermi systems. We consider in detail spinless fermions on…
Theory of electrons with orbital degeneracy
You-Quan Li, U. Eckern
The Hubbard model for electrons with orbital degeneracy is shown to have an underlying SU_d(4) symmetry of spin-orbital double. A hidden charge SU_c(4) symmetry is exposed and an e…
Ghost spins and novel quantum critical behavior in a spin chain with local bond-deformation
Jian-Hui Dai, Yupeng Wang, U. Eckern
We study the boundary impurity-induced critical behavior in an integrable SU(2)-invariant model consisting of an open Heisenberg chain of arbitrary spin- (Takhatajian-Babujian m…
Scalar potential effect in an integrable Kondo model
Yupeng Wang, U. Eckern
To study the impurity potential effect to the Kondo problem in a Luttinger liquid, we propose an integrable model of two interacting half-chains coupled with a single magnetic impu…
Anderson-localization versus delocalization of interacting fermions in one dimension
P. Schmitteckert, T. Schulze, C. Schuster +2
Using the density matrix renormalization group algorithm, we investigate the lattice model for spinless fermions in one dimension in the presence of a strong interaction and disord…