Size and dimensionality effect in single-impurity Anderson model

Size and dimensionality effect in single-impurity Anderson model

The asymmetric single - impurity Anderson model – the modified perturbation theory

——————————————————————————————————————— Abstract We investigate the single-impurity Anderson model by means of the recently introduced modified perturbation theory. This approximation scheme yields reasonable results away from the symmetric case. The agreement with exactly known results for the symmetric case is checked, and results for the non-symmetric case are presented. With decreasing cond...

Anderson impurity in a semiconductor.

We study an Anderson impurity in a semiconducting host using the density matrix renormalization group technique. We use the U50 one-dimensional Anderson Hamiltonian at half filling as the semiconducting host since it has a hybridization gap. By varying the hybridization of the host, we can control the size of the semiconducting gap D . We consider chains with 25 sites and we place the Anderson ...

Real-time simulations of nonequilibrium transport in the single-impurity Anderson model

F. Heidrich-Meisner,1 A. E. Feiguin,2,3 and E. Dagotto4 1Institut für Theoretische Physik C, RWTH Aachen University, 52056 Aachen, Germany and JARA–Jülich Aachen Research Alliance, Forschungszentrum Jülich, 52425 Jülich, Germany 2Microsoft Project Q, University of California, Santa Barbara, California 93106, USA 3Condensed Matter Theory Center, University of Maryland, College Park, Maryland 207...

ac response in the nonequilibrium Anderson impurity model.

The ac response of a single Anderson impurity coupled to two reservoirs with different chemical potentials is studied using an equation of motion approach. In the Kondo regime, we show that resonant behavior in the ac response is found in the low-frequency limit and the frequency of the ac field matches the chemical potential differences. The resonant behavior is a direct consequence of the “do...