2014/10/08 by F. Grusdt, Y. E. Shchadilova, A. N. Rubtsov +1 · 1 citation
Physics and Astronomy · #cond-mat.quant-gas #cond-mat.mes-hall
paper · pdf · doi:10.1038/srep12124
published as Sci. Rep. 5, 12124 (2015) · 13 pages, 7 figures
arxiv created 2014/10/08 · arxiv updated 2016/05/03
We develop a renormalization group approach for analyzing Fröhlich polarons and apply it to a problem of impurity atoms immersed in a Bose-Einstein condensate of ultra cold atoms. Polaron energies obtained by our method are in excellent agreement with recent diagrammatic Monte Carlo calculations for a wide range of interaction strengths. We calculate the effective mass of polarons and find a smooth crossover from weak to strong coupling regimes. Possible experimental tests of our results in current experiments with ultra cold atoms are discussed.