Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discrete intrinsic localized modes in a microelectromechanical resonator   Intrinsic Localized Modes (ILMs) or Discrete Breathers (DBs) are produced
through a non-linear vibration localization phenomenon. While Anderson
localization is due to lattice defects, the nonlinearity of lattices provides
the basis for ILM excitation. Over the past two decades, these ILMs have been
realized in a wide range of physical systems including photonic crystals,
nonlinear atomic lattices, anti-ferromagnets, coupled Josephson junction arrays
and coupled cantilevers. This paper brings out the feasibility of exciting ILMs
in a standalone mechanical resonator. Through piezoelectric driving and optical
visualization, various intriguing features of ILMs have been recorded. The ILMs
in our system are observed as spectral bushes and their frequencies are much
lower than that of the drive frequency. The excitation of ILMs is mediated
through large amplitude instability following autoparametric excitation of a
sub-harmonic mode. The spatial prevalence of discrete ILM excitations is at
antinodes of the sub-harmonic mode. Further, the ILMs have been observed to be
time-variant and various events including attraction-repulsion (or
splitting-merging) of ILMs and hopping occur during the time evolution of ILMs.

5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int