Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Explicit secular equations for piezoacoustic surface waves: Rayleigh
  modes   The existence of a two-partial Rayleigh wave coupled to an electrical field
in 2mm piezoelectric crystals is known but has rarely been investigated
analytically. It turns out that the Z-cut, X-propagation problem can be fully
solved, up to the derivation of the secular equation as a polynomial in the
squared wave speed. For the metallized (unmetallized) boundary condition, the
polynomial is of degree 10 (48). The relevant root is readily identified and
the full description of the mechanical and electrical fields follows. The
results are illustrated in the case of the superstrong piezoelectric crystal,
Potassium niobate, for which the effective piezoelectric coupling coefficient
is calculated to be about 0.1

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The categories of this paper are: stat
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
0
The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: eess
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con