Polaronic mass renormalization of impurities in BEC: correlated Gaussian wavefunction approach
arXiv:1410.5691 · doi:10.1103/PhysRevA.93.043606
Abstract
We propose a class of variational Gaussian wavefunctions to describe Fröhlich polarons at finite momenta. Our wavefunctions give polaron energies that are in excellent agreement with the existing Monte Carlo results for a broad range of interactions. We calculate the effective mass of polarons and find smooth crossover between weak and intermediate impurity-bosons coupling. Effective masses that we obtain are considerably larger than those predicted by the mean-field method. A novel prediction based on our variational wavefunctions is a special pattern of correlations between host atoms that can be measured in time-of-flight experiments. We discuss atomic mixtures in systems of ultracold atoms in which our results can be tested with current experimental technology.
6 pages, 4 figures + Supplementary Materials
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Cited by in corpus (48)
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