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Paper detail

Variational Polaron Method for Bose-Bose Mixtures

We study degenerate mixtures of "heavy" bosons and "light" superfluid bosons using a variational polaron transformation. We consider the Mott insulator-superfluid transition of the heavy species and find that at $T=0$ interaction favors the superfluid phase of the heavy species. Our analytic results agree well with numerically exact quantum Monte Carlo simulations in two dimensions. We then show that in three dimensions the variational polaron transformation can be combined with a Gutzwiller approximation to give good results.

preprint2014arXivOpen access
David BenjaminEugene Demler
cond-mat.stat-mechcond-mat.quant-gas
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David BenjaminEugene Demler

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