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- W2016364103 abstract "The superfluid transition in a two-dimensional $^{4}mathrm{He}$ system has been studied using computational-path-integral methods. Thermodynamic and structural properties, the single-particle momentum distribution, the one-particle off-diagonal density matrix (or order-parameter correlation function), the momentum correlations, the superfluid density (based on the winding-number distribution) and the vorticity correlation function were calculated for temperatures above and below the superfluid transition for a film density of 0.0432 A${r{}}^{mathrm{ensuremath{-}}2}$ (which corresponds to zero pressure in the ground state). The order-parameter correlation function shows an algebraic decay in good agreement with spin-wave theory. An indirect estimate based on an analysis of finite-size effects using the Kosterlitz-Thouless recursion relations leads to a vortex diameter of 3.7ifmmodepmelsetextpmfi{}0.4 Ar{}, a vortex core energy of 2.7ifmmodepmelsetextpmfi{}0.2 K and a critical temperature of 0.72ifmmodepmelsetextpmfi{}0.02 K." @default.
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- W2016364103 date "1989-02-01" @default.
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- W2016364103 title "Path-integral simulation of the superfluid transition in two-dimensional<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>He</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>" @default.
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- W2016364103 doi "https://doi.org/10.1103/physrevb.39.2084" @default.
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