Simulation of a molecular structure formation as a result of thermal disruption in amorphous carbon

Authors

  • A.M. Popov Lomonosov Moscow State University
  • A.A. Grishanin Lomonosov Moscow State University
  • N.G. Nikishin Lomonosov Moscow State University
  • G.N. Shumkin IBM Science and Technology Center in Russia https://orcid.org/0000-0003-1858-8001

Keywords:

multiscale quantum molecular dynamics codes, phase transition in amorphous carbon, phase change memory, nanotechnology, supercomputer IBM BlueGene/P

Abstract

A multiscale model of phase-change memory is proposed. A phase transition is self-consistently simulated on three different time-space levels. On the first level, we use ab initio quantum molecular dynamics calculations with consideration of a temperature distribution. On the second level, the time-dependent evolution of the electronic density is simulated on the basis of the reduced Ehrenfest molecular dynamics near the line of the phase transition of the second kind. On the third level, we use the heat conduction equation in continuous media to calculate a new temperature distribution. Our calculations show the appearance of a graphitic layer structure from an amorphous state under the influence of temperature effects. The electronic density evolution leads to a localization in space of the electric conductivity. A space-localized heat source causes the thermal instability and, hence, maintains the structure. Such a behavior could explain the appearance of the S-shaped volt-ampere characteristic in a conducting nanodot during experiments. The IBM BlueGene/P supercomputer installed at the Faculty of Computational Mathematics and Cybernetics of the Lomonosov Moscow State University was used.

Author Biographies

A.M. Popov

A.A. Grishanin

N.G. Nikishin

G.N. Shumkin

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Published

01-04-2014

How to Cite

Попов А.М., Гришанин А.А., Никишин Н.Г., Шумкин Г.Н. Simulation of a Molecular Structure Formation As a Result of Thermal Disruption in Amorphous Carbon // Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie). 2014. 15. 201-210

Issue

Section

Section 1. Numerical methods and applications