Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental demonstration of an anisotropic exceptional point   Exceptional points (EPs) associated with a square-root singularity have been
found in many non-Hermitian systems. In most of the studies, the EPs found are
isotropic meaning that the same singular behavior is obtained independent of
the direction from which they are approached in the parameter space. In this
work, we demonstrate both theoretically and experimentally the existence of an
anisotropic EP in an acoustic system that shows different singular behaviors
when the anisotropic EP is approached from different directions in the
parameter space. Such an anisotropic EP arises from the coalescence of two
square-root EPs having the same chirality.

21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph