Search: onr:"swepub:oai:gup.ub.gu.se/66704" >
Comparison of Appro...
Comparison of Approximate Quantum Simulation Methods Applied to Normal Liquid Helium at 4 K
- Article/chapterEnglish2007
Publisher, publication year, extent ...
-
2007-11-21
-
American Chemical Society (ACS),2007
Numbers
-
LIBRIS-ID:oai:gup.ub.gu.se/66704
-
https://gup.ub.gu.se/publication/66704URI
-
https://doi.org/10.1021/jp075022nDOI
Supplementary language notes
Part of subdatabase
Classification
-
Subject category:ref swepub-contenttype
-
Subject category:art swepub-publicationtype
Notes
-
The Feynman-Kleinert linearized path integral molecular dynamics (FK-LPI), ring polymer molecular dynamics (RPMD), and centroid molecular dynamics (CMD) methods are applied to the simulation of normal liquid helium. Comparisons of the simulation results at the T = 4 K and = 0.01873 Å-3 state point are presented. The calculated quantum correlation functions for the three methods show significant differences, both in the short time and in the intermediate regions of the spectrum. Our simulation results are also compared to the recent results of other approximate quantum simulation methods. We find that FK-LPI qualitatively agrees with other approximate quantum simulation results while CMD and RPMD predict a qualitatively different impulsive rebound in the velocity autocorrelation function. Frequency space analysis reveals that RPMD exhibits a broad high-frequency tail similar to that from quantum mode coupling theory and numerical analytic continuation approaches, while FK-LPI provides a somewhat more rapid decay at high frequency than any of these three methods. CMD manifests a high-frequency component that is greatly reduced compared with the other methods.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
-
Poulsen, Jens Aage,1972Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry(Swepub:gu)xpouje
(author)
-
Rossky, Peter J
(author)
-
Manolopoulos, David E
(author)
-
Göteborgs universitetInstitutionen för kemi
(creator_code:org_t)
Related titles
-
In:The journal of physical chemistry. B: American Chemical Society (ACS)112:21520-61061520-5207
Internet link
Find in a library
To the university's database