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What is your thought on the following statement: "any system of (weak/ strong) interacting bosons, in liquid phase, will form a condensate at T=0". Any example or counter-example ? Will dimensionality play any role? Thanks!

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    $\begingroup$ Many counter examples. In one spatial dimension there is no spontaneous symmetry breaking at $T=0$. In two dimensions, interacting bosons in a lattice can form a Mott insulator. $\endgroup$ – Meng Cheng Sep 12 '15 at 0:45
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No, most bosonic atoms (all except H and He) form solids. In fact, most of the BECs studied experimentally with ultracold atomic gases are metastable. The true ground state is a solid.

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  • $\begingroup$ Thanks! Probably I wanted ask about liquid phase, please see the edit. $\endgroup$ – Jon Snow Sep 12 '15 at 0:59
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    $\begingroup$ Yes, but if you ask about T=0 then you are asking what kind of materials have a stable liquid phase at T=0. The answer is not many. $\endgroup$ – Thomas Sep 12 '15 at 1:03

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