Zobrazeno 1 - 10
of 1 317
pro vyhledávání: '"Koller W"'
Autor:
Hansen S, Sohr D, Geffers C, Astagneau P, Blacky A, Koller W, Morales I, Moro ML, Palomar M, Szilagyi E, Suetens C, Gastmeier P
Publikováno v:
BMC Proceedings, Vol 5, Iss Suppl 6, p O2 (2011)
Externí odkaz:
https://doaj.org/article/920bc55366df49dd962caf42b2cf571e
Publikováno v:
Pteridines, Vol 2, Iss 2, Pp 95-97 (1990)
Externí odkaz:
https://doaj.org/article/a6f2885a69e24f1387c6e2b6880b1cab
Publikováno v:
Lecture Notes in Physics, vol. 678, pp. 31 - 45, Springer 2005
Effective models are derived from the ferromagnetic Kondo lattice model with classical corespins, which greatly reduce the numerical effort. Results for these models are presented. They indicate that double exchange gives the correct order of magnitu
Externí odkaz:
http://arxiv.org/abs/cond-mat/0512462
Autor:
Koller, W., Dupuis, N.
Publikováno v:
J. Phys.: Condens. Matter 18 (2006) 9525-9540
We discuss the application of the variational cluster perturbation theory (VCPT) to the Mott-insulator--to--superfluid transition in the Bose-Hubbard model. We show how the VCPT can be formulated in such a way that it gives a translation invariant ex
Externí odkaz:
http://arxiv.org/abs/cond-mat/0511294
We show that a strongly renormalized band of polaronic quasiparticle excitations is induced at the Fermi level of an interacting many-electron system on increasing the coupling of the electrons to local phonons. We give results for the local density
Externí odkaz:
http://arxiv.org/abs/cond-mat/0508463
We show that quasiparticles in a magnetic field of arbitrary strength $H$ can be described by field dependent parameters. We illustrate this approach in the case of an Anderson impurity model and use the numerical renormalization group (NRG) to calcu
Externí odkaz:
http://arxiv.org/abs/cond-mat/0508465
We investigate the two- and three-dimensional ferromagnetic Kondo lattice model by unbiased Monte Carlo simulations. A phase diagram for the two-dimensional model is presented, in which the stability of magnetic order and ferromagnetic polarons is ex
Externí odkaz:
http://arxiv.org/abs/cond-mat/0410274
Publikováno v:
Physica B359, 804 (2005)
We investigate the 2D ferromagnetic Kondo lattice model for manganites with classical corespins at Hund's rule coupling J_H=6, with antiferromagnetic superexchange 0.03 < J' < 0.05. We employ canonical and grand canonical unbiased Monte Carlo simulat
Externí odkaz:
http://arxiv.org/abs/cond-mat/0406635
We present the phase diagram and dynamical correlation functions for the Holstein-Hubbard model at half filling and at zero temperature. The calculations are based on the Dynamical Mean Field Theory. The effective impurity model is solved using Exact
Externí odkaz:
http://arxiv.org/abs/cond-mat/0406241
We present results on the dynamical correlation functions of the particle-hole symmetric Holstein-Hubbard model at zero temperature, calculated using the dynamical mean field theory which is solved by the numerical renormalization group method. We cl
Externí odkaz:
http://arxiv.org/abs/cond-mat/0404328