Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electrically and Magnetically Resonant dc SQUID Metamaterials   We propose a superconducting metamaterial design consisting of meta-atoms
(MAs) which are each composed of a direct current (dc) superconducting quantum
interference device (SQUID) and a superconducting rod. This design provides
negative refraction index behavior for a wide range of structure parameters.

23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
16
The categories of this paper are: stat
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph