Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 36: Ultra-Cold Atoms, Ions and BEC V (with Q)

A 36.3: Vortrag

Freitag, 6. März 2009, 11:30–11:45, VMP 6 HS-C

Magnetism and Phase Transitions in High Temperature Superfluids — •Thomas Judd, Robin Scott, and Mark Fromhold — School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK

Magnetism and strong inter-particle interactions are believed to play a significant role in high temperature superconductors but not in conventional BCS superconductors. Many unanswered questions remain about the nature of their influence. However, recent advances in cold atom physics allow us to investigate these long standing issues from a new angle by studying superfluidity in strongly interacting atomic Fermi gases. It is also possible to consider how long range magnetic interactions affect the superfluid state. Theoretical work on such systems is limited by their complexity - conventional computer resources struggle to model three-dimensional Fermi gases at finite temperature with strong interactions which can undergo phase transitions and exhibit coherence. However, by exploiting high performance computing resources, these difficulties can be overcome and new insights gained. Here we present progress towards simulations of high temperature superflow in fermionic systems with magnetic interactions and optical lattices. We use a beyond-mean-field wave-mechanical model which includes fluctuations and second-order scattering terms. The model reproduces unanticipated results observed in recent BEC-BCS crossover experiments and also temperature phase transitions. We have begun work investigating how magnetic dipolar interactions affect the dynamics of rotating Bose gases and the formation of vortex lattices.