1,372 research outputs found
Metal-insulator transition and strong-coupling spin liquid in the Hubbard model
We study the phase diagram of the frustrated Hubbard model on
the square lattice by using a novel variational wave function. Taking the clue
from the backflow correlations that have been introduced long-time ago by
Feynman and Cohen and have been used for describing various interacting systems
on the continuum (like liquid He, the electron jellium, and metallic
Hydrogen), we consider many-body correlations to construct a suitable
approximation for the ground state of this correlated model on the lattice. In
this way, a very accurate {\it ansatz} can be achieved both at weak and strong
coupling. We present the evidence that an insulating and non-magnetic phase can
be stabilized at strong coupling and sufficiently large frustrating ratio
.Comment: 8 pages, Proceedings of the HFM2008 Conferenc
Metal-insulator transition and strong-coupling spin liquid in the Hubbard model
We study the phase diagram of the frustrated Hubbard model on
the square lattice by using a novel variational wave function. Taking the clue
from the backflow correlations that have been introduced long-time ago by
Feynman and Cohen and have been used for describing various interacting systems
on the continuum (like liquid He, the electron jellium, and metallic
Hydrogen), we consider many-body correlations to construct a suitable
approximation for the ground state of this correlated model on the lattice. In
this way, a very accurate {\it ansatz} can be achieved both at weak and strong
coupling. We present the evidence that an insulating and non-magnetic phase can
be stabilized at strong coupling and sufficiently large frustrating ratio
.Comment: 8 pages, Proceedings of the HFM2008 Conferenc
Unidirectional d-wave superconducting domains in the two-dimensional t-J model
Motivated by the recently observed pattern of unidirectional domains in
high-T_c superconductors [Y. Kohsaka et al., Science 315, 1380 (2007)], we
investigate the emergence of spontaneous modulations in the d-wave
superconducting resonating valence bond phase using the t-J model at x=1/8
doping. Half-filled charge domains separated by four lattice spacings are found
to form along one of the crystal axis leading to modulated superconductivity
with out-of-phase d-wave order parameters in neighboring domains. Both
renormalized mean-field theory and variational Monte Carlo calculations yield
that the energies of modulated and uniform phases are very close to each other.Comment: 4 pages, 5 figures, minor revisions, and added reference
Relazione sull'intervento di controllo della Rete Sismica dell'Osservatorio Vesuviano all'Etna
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