Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 18: Ultracold atoms, ions, and BEC III (joint session A/Q)
Q 18.4: Talk
Tuesday, March 10, 2020, 15:00–15:15, f303
In-medium bound states of two bosonic impurities in a one-dimensional Fermi gas — David Huber1, Hans-Werner Hammer1,2, and •Artem Volosniev3 — 1TU Darmstadt, Darmstadt, Germany — 2ExtreMe Matter Institute EMMI, Darmstadt, Germany — 3IST Austria, Klosterneuburg, Austria
We investigate the ground-state energy of a one-dimensional Fermi gas with two bosonic impurities. We study the case where impurity and fermions have equal masses, and the impurity-impurity two-body interaction is identical to the fermion-impurity interaction, such that the system is solvable with the Bethe ansatz. For attractive interactions, we find that the energy of the impurity-impurity subsystem is below the energy of the bound state that exists without the Fermi gas. We interpret this as a manifestation of attractive boson-boson interactions induced by the fermionic medium, and refer to the impurity- impurity subsystem as an in-medium bound state. For repulsive interactions, we find no in-medium bound states.