The density-density correlation functions and the condensate fraction at the surface of liquid 4He were calculated using a path integral Monte Carlo method. Imaginary-time correlation functions were used to calculate the dispersion relation of surface excitations in a free helium surface. Results indicated that condensate fraction increased with decreased density, to a maximum value of 0.9, due to decreased zero-point motion from helium-helium interactions.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical review letters|
|State||Published - Jul 1 2002|
ASJC Scopus subject areas
- Physics and Astronomy(all)