September 15, 2014 to October 10, 2014
Nordita, Stockholm
Europe/Stockholm timezone

Morning Session: Strongly correlated electron systems

Oct 8, 2014, 9:30 AM
2h
132:028 (Nordita, Stockholm)

132:028

Nordita, Stockholm

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. --------------------------------------------------------------------- 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.

Presentation materials