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Diffusion Monte Carlo for Excited States: Phonons and Rotons in Superfluid 4He (1998)

Boronat, J. ; Casulleras, J.

Springer

Journal of low temperature physics 110 (1998), S. 443-448

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ISSN: 1573-7357

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We have applied the fixed-node and the released-node Monte Carlo techniques to calculate the phonon-roton excitation spectrum (ε(q)) of superfluid 4 He. An excellent agreement with the experimental spectrum is achieved both at the equilibrium and near the freezing densities. The strength of the single excitation peak Z(q) in the dynamic structure function S(q, ω) shows an overall agreement with experimental data. New results for ε(q) and Z(q) at a negative pressure close to the spinodal point are also reported.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1022577909884

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