Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 34.5: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Quantum breathing frequency of trapped dipolar gases — •Tobias Dornheim, Alexey Filinov, and Michael Bonitz — ITAP, Christian-Albrechts-Universität zu Kiel, Leibnizstraße 15, 24098 Kiel

The quantum breathing mode (BM), i.e. the monopole oscillation of trapped quantum particles, serves as an important method for diagnostics of a variety of finite sized systems [1]. We investigate the BM for harmonically confined bosonic atomic gases with dipole interaction and consider one and two dimensional systems for the whole range of coupling strengths and a variety of particle numbers. We begin our analysis with the ab initio calculation of thermodynamic properties like e.g. energies, superfluid fraction and densities of up to N∼10³ trapped particles, using a GPU accelerated realization of the Worm Algorithm Path Integral Monte Carlo scheme [2]. A recently published improved sum rule formalism [3] allows us to obtain an accurate upper bound for the breathing mode frequency. Finally we compare our results to available data for trapped fermions [3] and discuss the influence of Bose- and Fermi-statistics.

[1] C.R. McDonald et al., Phys. Rev. Lett., in press
[2] M. Boninsegni et al., Phys. Rev. E 74, 036701 (2006)
[3] J.W. Abraham et al., ArXiv e-prints 1311.5371, (2013)