Heidelberg 2015 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 23: Ultra-cold atoms, ions and BEC IV (with Q)
A 23.8: Vortrag
Mittwoch, 25. März 2015, 16:15–16:30, C/HSW
Many-Body Simulations of Ultracold 1D Atom-Ion Quantum Systems — •Johannes Schurer1,2, Peter Schmelcher1,2, and Antonio Negretti1,2 — 1Zentrum für Optische Quantentechnologien, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
We consider a trapped ensemble of interacting bosonic atoms in which a single strongly trapped ion is immersed. We focus on effects induced by the atom-ion interaction as the emergence of an additional length scale and the impact of bound states onto the properties of the system. Our study is carried out by means of the multilayer-multiconfiguration time-dependent Hartree method for bosons, a numerical exact method to calculate many-body quantum dynamics. As a first step, enabled through the development of a model interaction potential for the atom-ion interaction, we analyze the influence of the atom-atom interaction strength and the number of atoms on the ground state properties (see [1]). Further, we propose experimental viable strategies for the verification of our findings. Hereupon, we investigate the dynamics following a spontaneous creation of an ion in the atomic cloud. The additional length scale in the system becomes clearly apparent and we show the necessity of the description beyond a Gross-Pitaevskii type approach. These investigations serve as first building blocks for the understanding of hybrid atom-ion systems expected to exhibit intriguing phenomena as e.g. formation of molecular ions and ion induced density bubbles.
[1] Phys. Rev. A 90, 033601 (2014)