Speakers
Alexandre Leprévost
Olivier Juillet
Description
Olivier Juillet
Intertwined orders in strongly correlated electron systems.
The quantum phase diagram of the two-dimensional Hubbard
model is investigated through the mixing of unrestricted
Hartree-Fock and BCS wave-functions with symmetry
restoration before variation. The spin, charge, and
superconducting orders entailed in such correlated states
will be discussed as well as their evolution with hole
doping and the on-site Coulomb repulsion. The relevance of
the approach against exact results or numerical simulations
when available will also be addressed.
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Alexandre Leprévost
Exact ground state of strongly correlated electron systems
from symmetry-restored wave-functions
The four site Hubbard model is considered from the exact
diagonalization and variational method points of view. We
show that a symmetry projected mean-field theory recovers
the exact ground state energy, irrespective of the
interaction strength, in contrast to the conventional
Gutzwiller wave-function that will be also considered.
