12–17 Jun 2016
University of Ottawa
America/Toronto timezone
Welcome to the 2016 CAP Congress! / Bienvenue au congrès de l'ACP 2016!

Spatio-temporal correlations after a quantum quench in the Bose-Hubbard model

15 Jun 2016, 15:15
15m
SITE G0103 (University of Ottawa)

SITE G0103

University of Ottawa

SITE Building, 800 King Edward Ave, Ottawa, ON
Oral (Student, In Competition) / Orale (Étudiant(e), inscrit à la compétition) Division of Atomic, Molecular and Optical Physics, Canada / Division de la physique atomique, moléculaire et photonique, Canada (DAMOPC-DPAMPC) W3-6 Cold and Trapped Atoms, Molecules and Ions (DAMOPC) / Atomes, molécules et ions froids et piégés (DPAMPC)

Speaker

Matthew Fitzpatrick (Simon Fraser University)

Description

The Bose Hubbard model (BHM) is a minimal model that describes interacting ultracold bosons in an optical lattice, allowing the opportunity for experiments to probe quench dynamics of the model. Theoretically, it has proven challenging to study spatio-temporal correlations in the BHM in dimensions higher than one. We use the Schwinger-Keldysh technique and a strong-coupling expansion to develop a two-particle irreducible formalism that allows the study of spatio-temporal correlations in both the superfluid (SF) and Mott-insulating (MI) regimes during a quantum quench for dimensions higher than one. We obtain equations of motion for the superfluid order parameter and two-time correlation functions and present numerical results for the evolution of these functions. We relate our results to recent cold-atom experiments.

Primary author

Matthew Fitzpatrick (Simon Fraser University)

Co-author

Malcolm Kennett (Simon Fraser University)

Presentation materials