Path-integral calculations of normal liquid He3

Research output: Contribution to journalArticlepeer-review

Abstract

The first path-integral calculations of the properties of a strongly correlated continuum fermion system are described. The paths are restricted to the region of phase space with a positive trial density matrix, thereby avoiding the fermion sign problem. This restriction is exact if the nodes of the trial density matrix are correctly placed, but otherwise gives a physically reasonable approximation generalizing the "fixed-node" approximation used at zero temperature. Computations show that restricting the walks with the noninteracting density matrix gives good results for liquid 3He above 1 K. Using imaginary-time-independent nodes or not allowing atomic exchange results in substantially poorer agreement with experimental energies.

Original languageEnglish (US)
Pages (from-to)331-334
Number of pages4
JournalPhysical review letters
Volume69
Issue number2
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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