Zobrazeno 1 - 10
of 345
pro vyhledávání: '"Gulacsi, M."'
Autor:
Kapilevich, G. A., Riseborough, P. S., Gray, A. X., Gulacsi, M., Durakiewicz, Tomasz, Smith, J. L.
The compound SmB$_6$ is a Kondo Insulator, where the lowest-energy bulk electronic excitations are spin excitons. It also has surface states that are subjected to strong spin-orbit coupling. It has been suggested that SmB$_6$ is also a topological in
Externí odkaz:
http://arxiv.org/abs/1504.01179
By applying an exact unitary transformation to a two-band hamiltonian which also includes the effects due to large pnictogen polarizabilities, we show that an attractive spin-mediated Hubbard term appears in the $d_{xz}$, $d_{yz}$ nearest-neighbour c
Externí odkaz:
http://arxiv.org/abs/0912.1811
Autor:
Stoffel, A. J., Gulacsi, M.
Publikováno v:
Eur. Phys. J. B 67, 169 (2009)
We study in random-phase approximation the newly discovered supersolid phase of ${}^4$He and present in detail its finite temperature properties. ${}^4$He is described within a hard-core quantum lattice gas model, with nearest and next-nearest neighb
Externí odkaz:
http://arxiv.org/abs/0911.1698
Autor:
Stoffel, A. J., Gulacsi, M.
Publikováno v:
Eur. Phys. J. B 68, 79 (2009)
We investigate the newly discovered supersolid phase by solving in random-phase approximation the anisotropic Heisenberg model of the hard-core boson ${}^4$He lattice at zero temperature. We include nearest and next-nearest neighbor interactions and
Externí odkaz:
http://arxiv.org/abs/0911.1220
Autor:
Stoffel, A., Gulacsi, M.
Publikováno v:
Europhys. Lett. 85, 20009 (2009)
We investigate the newly discovered supersolid phase by solving in random phase approximation the anisotropic Heisenberg model of the hard-core boson ${}^4$He lattice. We include nearest and next-nearest neighbor interactions and calculate exactly al
Externí odkaz:
http://arxiv.org/abs/0810.0996
Publikováno v:
Phys. Rev. Lett. 101, 106408 (2008)
A comprehensive theory of electron spin resonance (ESR) for a Luttinger liquid (LL) state of correlated metals is presented. The ESR measurables such as the signal intensity and the line-width are calculated in the framework of Luttinger liquid theor
Externí odkaz:
http://arxiv.org/abs/0805.1113
We study the macroscopic quantum self-trapping effect in a mixture of Bose-Einstein condensate and a large number of quantum degenerate fermions, trapped in a double-well potential with a variable separation between the wells. The large number of fer
Externí odkaz:
http://arxiv.org/abs/0803.4048
Autor:
Brydon, P. M. R., Gulacsi, M.
Publikováno v:
Phys. Rev. B 73, 235120 (2006)
We examine the spinless one-dimensional Falicov-Kimball model (FKM) below half-filling, addressing both the binary alloy and valence transition interpretations of the model. Using a non-perturbative technique, we derive an effective Hamiltonian for t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0603628
Autor:
Brydon, P. M. R., Gulacsi, M.
Publikováno v:
Phys. Rev. Lett. 96, 036407 (2006).
We use a novel approach to analyze the one dimensional spinless Falicov-Kimball model. We derive a simple effective model for the occupation of the localized orbitals which clearly reveals the origin of the known ordering. Our study is extended to a
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506218
Publikováno v:
Phys. Rev. B 72, 125122 (2005)
We present a Hartree-Fock study of the Falicov-Kimball model extended by both on-site and non-local hybridization. We examine the interplay between excitonic effects and the charge-density wave (CDW) instability known to exist at zero hybridization.
Externí odkaz:
http://arxiv.org/abs/cond-mat/0506159