Momentum distribution of liquid helium

Details Momentum distribution of liquid helium Momentum distribution of liquid helium

1996-08-27

arxiv.org/abs/cond-mat/9608134v1

Physics

Condensed Matter

10 pages, REVTeX, 12 figures

Scientific paper

10.1103/PhysRevB.55.1040

We have obtained the one--body density matrix and the momentum distribution $n(p)$ of liquid $^4$He at $T=3D0^o$K from Diffusion Monte Carlo (DMC) simulations, using trial functions optimized via the Euler Monte Carlo (EMC) method. We find a condensate fraction smaller than in previous calculations. Though we do not explicitly include long--range correlations in our calculations, we get a momentum distribution at long wavelength which is compatible with the presence of long--range correlations in the exact wave function. We have also studied $^3$He, using fixed--node DMC, with nodes and trial functions provided by the EMC. In particular, we analyze the momentum distribution $n(p)$ with respect to the discontinuity $Z$ as well as the singular behavior, at the Fermi surface. We also show that an approximate factorization of the one-body density matrix $\rho(r)\simeq \rho_0(r)\rho_B(r)$ holds, with $\rho_0(r)$ and $\rho_B(r)$ respectively the density matrix of the ideal Fermi gas and the density matrix of a Bose $^3$He.

Affiliated with

Also associated with

No associations

Rating

Momentum distribution of liquid helium does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Momentum distribution of liquid helium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Momentum distribution of liquid helium will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-170301