Workshops & seminars

Wavefunctions for strong correlation drawn from exactly solvable models
Dr. Paul Andrew Johnson(Laval)

Friday, April 6, 2018
2:30 p.m. – 4 p.m.

Dr. Paul Andrew Johnson


This event is free



Hingston Hall, wing HC
7141 Sherbrooke W.
Room HC-155



Abstract:  The established methods of quantum chemistry are built upon the orbital picture: electrons interact only with the average field produced by the other electrons. The wavefunction is a Slater determinant of the occupied orbitals. Such an approach is expedient when it is possible to unambiguously label each orbital as occupied or unoccupied. These types of systems are weakly-correlated and are generally well treated by existing methods. On the other hand, when it is difficult to label orbitals as occupied or unoccupied, the wavefunction is not a single Slater determinant, and further, the number of important determinants grows exponentially with the system size. These types of systems are strongly-correlated. Our goal is to develop accurate and affordable techniques for strongly-correlated systems. We employ the eigenvectors of exactly solvable models as a starting point to expand the physical wavefunction. We will outline our approach with a simple model built upon pairs of electrons.‚Äč

Bio:  Paul Johnson was a Vanier Canada Graduate Scholar under the supervision of Paul Ayers at McMaster, and Dimitri Van Neck and Patrick Bultinck in Ghent. He was a postdoc with Gustavo Scuseria before starting as an assistant professor at Universit√© Laval.


Dr. Johnson is the guest of Dr. Gilles Peslherbe.

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