Random pinning elucidates the nature of melting transition in two-dimensional core-softened potential systemстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 26 декабря 2017 г.
Аннотация:Despite about forty years of investigations, the nature of the melting transition in two
dimensions is not completely clear. In the framework of the most popular Berezinskii–
Kosterlitz–Thouless–Halperin–Nelson–Young (BKTHNY) theory, 2D systems melt through
two continuous Berezinskii–Kosterlitz–Thouless (BKT) transitions with intermediate hexatic
phase. The conventional first-order transition is also possible. On the other hand,
recently on the basis of computer simulations the new melting scenario was proposed
with continuous BKT type solid–hexatic transition and first order hexatic–liquid transition.
However, in the simulations the hexatic phase is extremely narrow that makes its study
difficult. In the present paper, we propose to apply the random pinning to investigate
the hexatic phase in more detail. The results of molecular dynamics simulations of two
dimensional system having core-softened potentials with narrow repulsive step which is
similar to the soft disk system are outlined. The system has a small fraction of pinned
particles giving quenched disorder. Random pinning widens the hexatic phase without
changing the melting scenario and gives the possibility to study the behavior of the
diffusivity and order parameters in the vicinity of the melting transition and inside the
hexatic phase.