4 papers
Insulator-Metal Transition in the Rutile-based VO2
M. S. Laad, L. Craco, E. Müller-Hartmann
The metal-insulator transition (MIT) in paramagnetic VO2 is studied within LDA+DMFT(IPT), which merges the local density approximation (LDA) with dynamical mean field theory (DMFT)…
Towards a Fully Ab-Initio Description of the Diluted Magnetic Semiconductor . Ferromagnetism, Electronic Structure, and Optical Response
L. Craco, M. S. Laad, E. Müller-Hartmann
There are two competing views of itinerant ferromagnetism, the first viewing ferromagnetism as resulting from the indirect coupling between local moments via the itinerant carrier…
Disordered Hubbard model in
L. Craco, M. S. Laad, E. Müller-Hartmann
We investigate the effects of static, diagonal disorder in the Hubbard model by treating the dynamical effects of local Hubbard correlations and disorder on an equal foo…
Ferromagnetism in the Hubbard model on the square lattice: Improved instability criterion for the Nagaoka state
P. Wurth, G. Uhrig, E. Mueller-Hartmann
The instability of the fully polarized ferromagnetic state (Nagaoka state) with respect to single spin flips is re-examined for the Hubbard model on the square lattice with a large…