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A: Fachverband Atomphysik

A 29: Ultra-cold atoms, ions and BEC III (with Q)

A 29.2: Vortrag

Mittwoch, 19. März 2014, 14:30–14:45, UDL HS3038

Field-theoretical Study of the Bose Polaron - Challenges for Quantum Simulation with ultracold Atoms — •Richard Schmidt^1,2 and Steffen Patrick Rath³ — ¹ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA — ²Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA — ³Technische Universitaet Muenchen, James-Franck-Straße, 85748 Garching, Germany

We study the properties of the Bose polaron, an impurity strongly interacting with a Bose-Einstein condensate, using a field-theoretic approach and make predictions for the spectral function and various quasiparticle properties that can be tested in experiment. We find that most of the spectral weight is contained in a coherent attractive and a metastable repulsive polaron branch. We show that the qualitative behavior of the Bose polaron is well described by a T-matrix approximation. We discuss the implications of our results for the attempted quantum simulation of the Froehlich Hamiltonian using ultra cold atoms.