Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 15: Ultracold atoms and BEC - III (with Q)
A 15.3: Talk
Tuesday, March 7, 2017, 15:00–15:15, N 1
Impurities immersed in a BEC. Quantum simulator of the polaron? — •Luis Aldemar Ardila1, Thomas Pohl1, and Stefano Giorgini2 — 1Nöthnitzer Straße 38 01187 Dresden Germany — 2Via Sommarive 14 I-38123 Povo, Italy
We investigate the properties of an impurity immersed in a Bose gas at zero temperature using both analytical and Quantum-Monte Carlo methods. The interaction between bosons are modeled by a hard-sphere potential with scattering length a, whereas the impurity-boson interaction is modeled by a short-range attractive square-well potential, where both the sign and the strength of the scattering length b can varied by adjusting the well depth. We characterize the repulsive and attractive [Fig. 1] polaron branch by calculating the binding energy and the effective mass [1]. Furthermore, we study the structure of the bosonic bath such as the boson-boson correlation function and the density profile around the impurity. For resonant interactions between the impurity and the bosonic bath, the Ground state properties are also investigated as well as Efimov Effects . The implication for the phase diagram of binary Bose-Bose mixtures is also discussed . We also discuss more complicated interactions between the impurity and the bosonic bath. For this case we consider a Quasi-2D Dipolar Bose gas at zero temperature. Furthermore, the impurity-Bose interaction is dipolar. Using perturbation theory, the Ground-state properties are investigated based on the low-energy Fröhlich Hamiltonian.