Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-Hermiticity Induced Flat Band   We demonstrate the emergence of an entire flat band embedded in dispersive
bands at the exceptional point of a PT symmetric photonic lattice. For this to
occur, the gain and loss parameter effectively alters the size of the partial
flat band windows and band gap of the photonic lattice simultaneously. The mode
associated with the entire flat band is robust against changes in the system
size and survives even at the edge of the lattice. Our proposal offers a route
for controllable localization of light in non-Hermitian systems and a technique
for measuring non-Hermiticity via localization.

37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc