Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Capillary fluctuations of surface steps: An atomistic simulation study
  for the model Cu(111) system   Molecular dynamics (MD) simulations are employed to investigate the capillary
fluctuations of steps on the surface of a model metal system. The fluctuation
spectrum, characterized by the wave number ($k$) dependence of the mean squared
capillary-wave amplitudes and associated relaxation times, is calculated for
$\left<110\right>$ and $\left<112\right>$ steps on the $\{111\}$ surface of
elemental copper near the melting temperature of the classical potential model
considered. Step stiffnesses are derived from the MD results, yielding values
from the largest system sizes of $(37\pm1) \,
\mathrm{meV}/\mathring{\mathrm{A}}$ for the different line orientations,
implying that the stiffness is isotropic within the statistical precision of
the calculations. The fluctuation lifetimes are found to vary by approximately
four orders of magnitude over the range of wave numbers investigated,
displaying a $k$ dependence consistent with kinetics governed by step-edge
mediated diffusion. The values for step stiffness derived from these
simulations are compared to step free energies for the same system and
temperature obtained in a recent MD-based thermodynamic-integration (TI) study
[Freitas, Frolov, and Asta, Phys. Rev. B 95, 155444 (2017)]. Results from the
capillary-fluctuation analysis and TI calculations yield statistically
significant differences that are discussed within the framework of
statistical-mechanical theories for configurational contributions to step free
energies.

6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
2
The categories of this paper are: math
14
The categories of this paper are: math-ph