Open AccessEffect of the direct correlation function on phase diagram of the two-mode phase field crystal model
Author(s) -
Chao Guo,
Zhijun Wang,
Jincheng Wang,
Yi Guo,
Sai Tang
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.108104
Subject(s) - phase diagram , phase (matter) , correlation function (quantum field theory) , mode (computer interface) , function (biology) , crystal (programming language) , diagram , condensed matter physics , materials science , field (mathematics) , correlation , gaussian , physics , mathematics , statistics , geometry , quantum mechanics , evolutionary biology , computer science , dielectric , pure mathematics , biology , programming language , operating system
Effects of the width of direct correlation function peak and the peak at k=0 on the phase diagram for the two-mode phase field crystal model are examined carefully. The results indicate that increasing the width of direct correlation function peak will expand the stability region of the ordered phases; however, increasing the ratio of peak width will significantly increase the fcc phase region but reduce the bcc phase region. Adding a negative Gaussian peak at k=0 to the two-mode approximate direct correlation function will compress the phase diagram and make the two-phase coexisting region narrow.