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NEW JOURNAL OF PHYSICS
Volume 7, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/7/1/078
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We have carried out extensive path integral Monte Carlo simulations of two-dimensional para-hydrogen (p-H-2) embedded in a crystalline matrix of alkali atoms. Our results show that, at low temperatures ( less than or similar to 5K), the thermodynamically stable phase of p-H-2 is a solid, commensurate with the underlying lattice. A nonzero superfluid signal for p-H-2 is observed in simulated systems of very small size (e.g. 13 molecules); however, results for systems of larger sizes are altogether consistent with absence of superfluidity in the thermodynamic limit.
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