Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonreciprocal optical response in parity-breaking superconductors   Superconductivity, an emergence of a macroscopic quantum state, gives rise to
unique electromagnetic responses leading to perfect shielding of magnetic field
and zero electrical resistance. In this paper, we propose that superconductors
with the space-inversion symmetry breaking host giant nonreciprocal optical
phenomena, such as photocurrent generation and second harmonic generation. The
nonreciprocal optical responses show divergent behaviors in the low-frequency
regime and originate from two-fold indicators unique to parity-breaking
superconductors, namely, the nonreciprocal superfluid density and the Berry
curvature derivative. Furthermore, the mechanism and frequency dependence are
closely tied to the preserved temporal symmetry in the superconductor. The
relation is useful for probing the space-time structure of the superconducting
symmetry. The indicators characterize the low-frequency property of
nonreciprocal optical responses and hence quantify the performance of
superconductors in nonreciprocal optics.

37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int