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Past Events
Looking into the Relation between Quantum Phase Transition and Entanglement via Density Functional Theory
| Organizer: | Center of Theoretical and Computational Physics & Physics Department |
| Speaker: | Prof. Lian-Ao WU |
| Affiliation: | University of the Basque Country, Spain |
| Date: | December 1, 2009 (Tue) |
| Time: | 4:00-5:00 p.m. |
| Venue: | Room 522, 5/F, Chong Yuet Ming Physics Building, HKU |
Abstract:
Density functional theory (DFT) is shown to provide a novel conceptual and computational framework for entanglement in interacting many-body quantum systems. DFT can, in particular, shed light on the intriguing relationship between quantum phase transitions and entanglement. We use DFT concepts to express entanglement measures in terms of the first or second derivative of the ground state energy. We illustrate the versatility of the DFT approach via a variety of analytically solvable models. As a further application we discuss entanglement and quantum phase transitions in the case of mean field approximations for realistic models of many-body systems.
Coffee and tea will be served 20 minutes prior to the seminar.