Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 14: Quantengase: Bosonen 2

Q 14.8: Vortrag

Montag, 12. März 2012, 18:15–18:30, V47.02

Josephson oscillations and self-trapping in coupled 1D Bose gases — •Matthias Strauss and Michael Fleischhauer — Fachbereich Physik, Technische Universität Kaiserslautern, D-67663 Kaiserslauternrn

We discuss the dynamics of a pair of tunnel-coupled, trapped one-dimensional Bose gases, where initially all particles are in one of the two traps. The simulation of the time evolution of interacting quantum systems is still a big challenge,and numerically exact methods are often only valid for short times or low particle numbers. For weak interactions and bosonic systems a powerful alternative is the truncated Wigner approximation.On applying this method to the single-particle eigenstates of the harmonic trap, we can simulate the dynamics of 1D gases for long times and high particle numbers (i.e. up to 200) and experimentally realistic interaction strength (gamma < 1/100). For large inter-tube tunneling rates we find damped Josephson and quadrupole oscillations and relaxation to a thermal state which we compare to thermal Bethe Ansatz solutions in LDA. We then consider the regime of self-trapping, where in particular the effects of the trap potential are discussed.