Entangled-plaquette variational wave function for frustrated quantum spin models on a lattice
- Date
- Jan 16, 2014
- Time
- 2:45 PM - 3:45 PM
- Speaker
- Dr. Fabio Mezzacapo
- Affiliation
- Université de Strasbourg
- Language
- en
- Main Topic
- Materialien
- Other Topics
- Materialien, Physik
- Host
- Grit Rötzer
- Description
- The entangled-plaquette wave function is a variational ansatz which allows an accurate study of the ground-state properties of quantum many-body systems on a lattice. The key idea is to cover the lattice with plaquettes and obtain a state whose configurational weights can be efficiently optimized by means of a variational Monte Carlo algorithm. In this talk I will discuss results for the ground-state phase diagram of the spin-1/2 J1-J2 model on a honeycomb and square lattice.. In both cases, we found (for intermediate values of J2/J1) a paramagnetic phase with no valence-bond crystalline order "sandwiched" between two (Neel and collinear) magnetic phases. We also show that, the reduction of the half-filled Hubbard model to the model studied here does not yield accurate predictions. .
- Links
Last modified: Jan 16, 2014, 8:48:49 AM
Location
Leibniz Institut für Festkörper- und Werkstoffforschung Dresden (D2E.27, IFW Dresden)Helmholtzstraße2001069Dresden
- Homepage
- http://www.ifw-dresden.de
Organizer
Leibniz Institut für Festkörper- und Werkstoffforschung DresdenHelmholtzstraße2001069Dresden
- Homepage
- http://www.ifw-dresden.de
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