Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simulations of metastable states near the apex of a force microscope tip
  interacting with an ionic crystalline surface   Atoms or pairs of ions picked up by probe tips used in dynamic force
microscopy (DFM) can be strongly displaced and even hop discontinuously upon
approach to the sample surface. The energy barriers for some of those hops are
of the right order of magnitude to explain the rise in energy dissipation
commonly observed in DFM measurements at room temperature. The systematic
computations reported here can explain the infrequent jumps and very low
average energy dissipation observed low temperature in a previous DFM study on
a KBr(001) sample. Close to the surface we indeed find new states separated by
small energy barriers which account for those phenomena. These energy barriers
strongly depend on details of the atomic arrangement in the vicinity of the tip
apex.

10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
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The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom