Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of De-Pinning of Monolayer Films Adsorbed on a Quartz Crystal
  Microbalance   In quartz crystal microbalance (QCM) studies of the friction between an
adsorbed monolayer film and a metallic substrate, the films are observed to
slide relative to the substrate under inertial forces of order $10^{-14}dyn$
per film atom, a force much smaller than all theoretical estimates of the force
that surface defects are capable of exerting. In this letter we propose, in
order to resolve this issue, that if the defect potentials have a range of
greater than an atomic spacing, the net force on a relatively stiff film due to
the defects is likely to be extremely small. Line defects (e.g., step and facet
edges and grain boundaries) as well as more localized defects (e.g., vacancies)
are considered.

26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas