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Bose Polarons

Luis A. Peña Ardila, University of Trento

20.01.2017 at 09:00 

An impurity immersed in a Bose-Einstein condensate gets dressed by the low-energy excitations of the quantum gas and forms a quasiparticle termed Bose polaron. In this talk I address the ground-state properties of the Bose polaron with perturbative methods when the impurity–bosonic bath coupling strength is weak. Furthermore the strongly interacting limit must be tackled with more sophisticated techniques. In particular we use Quantum Monte Carlo methods (QMC) at T=0 [1]. We compare our findings with the most recent experiments in JILA [2,3] and  Aarhus [4] for the ground-state energy.
Moreover with QMC we predict other quasiparticles properties such as the effective mass and structural properties of the bath such as the density profile that can be measured experimentally. Finally we study dipolar polarons and
the ground–state properties are remarkably different from the standard Bose polaron (only contact interactions) even at weak coupling [5]. The interplay between contact and dipolar coupling strengths might enhance the  ground-state properties.

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