Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Gulácsi *, Miklós"'
Publikováno v:
Europhys. Lett. 107, 57005, (2014)
It is known that a system which exhibits a half filled lowest flat band and the localized one-particle Wannier states on the flat band satisfy the connectivity conditions, is always ferromagnetic. Without the connectivity conditions on the flat band,
Externí odkaz:
http://arxiv.org/abs/1411.6477
Publikováno v:
Phil. Mag. Lett. 94, 269 (2014)
We model conducting pentagon chains with a multi orbital Hubbard model and prove that well below half filling exact ferromagnetic ground states appear. The rigorous method we use is based on the transformation of original hamiltonian into positive se
Externí odkaz:
http://arxiv.org/abs/1406.6796
Publikováno v:
Phil. Mag. 89, 2043 (2009)
We solve in random-phase approximation the anisotropic Heisenberg model, including nearest and next-nearest neighbour interactions by calculating all Green's functions and pair correlation functions in a cumulant decoupling scheme. The general exposi
Externí odkaz:
http://arxiv.org/abs/0911.1932
Publikováno v:
Phys. Status Solidi RRL 3, 169 (2009)
We study the low energy properties of warped monolayer graphene, where the symmetry of the original honeycomb lattice reveals itself. The zero energy solutions are Majorana fermions, whose wavefunction, originating from the corresponding modified Dir
Externí odkaz:
http://arxiv.org/abs/0911.1062
Autor:
Dóra, Balázs, Gulácsi, Miklós
Publikováno v:
Phys. Rev. B 78, 165111 (2008)
We study a nonuniversal contribution to the dephasing rate of conduction electrons due to local vibrational modes. The inelastic scattering rate is strongly influenced by multiphonon excitations, exhibiting oscillatory behaviour. For higher frequenci
Externí odkaz:
http://arxiv.org/abs/0806.1680
Publikováno v:
Phys. Rev. Lett. 99, 166402 (2007)
Recent NMR experiments by Singer et al. [Singer et al. Phys. Rev. Lett. 95, 236403 (2005).] showed a deviation from Fermi-liquid behavior in carbon nanotubes with an energy gap evident at low temperatures. Here, a comprehensive theory for the magneti
Externí odkaz:
http://arxiv.org/abs/0707.3348
Autor:
Gulacsi, Zsolt, Gulacsi, Miklos
Publikováno v:
Phys. Rev. B73, 014524 (2006)
Exact static nondegenerate stripe and checkerboard ground states are obtained in a two-dimensional generalized periodic Anderson model, for a broad concentration range below quarter filling. The random droplet states, also present in the degenerate g
Externí odkaz:
http://arxiv.org/abs/cond-mat/0602456
Autor:
Chan, Raymond, Gulacsi, Miklos
An effective hamiltonian is derived exactly for the one-dimensional periodic Anderson model via a canonical transformation. The canonical transformation has been calculated up to infinite order, thus an exact transformation was performed in the stric
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308405
Autor:
Bowen, Garry, Gulacsi, Miklos
Finite temperature properties of a non-Fermi liquid system is one of the most challenging probelms in current understanding of strongly correlated electron systems. The paradigmatic arena for studying non-Fermi liquids is in one dimension, where the
Externí odkaz:
http://arxiv.org/abs/cond-mat/0105154
Autor:
Honner, Graeme, Gulacsi, Miklos
We describe the transition from a ferromagnetic phase, to a disordered para- magnetic phase, which occurs in one-dimensional Kondo lattice models with partial conduction band filling. The transition is the quantum order-disorder transition of the tra
Externí odkaz:
http://arxiv.org/abs/cond-mat/9802164