Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-reciprocal Light-harvesting Nanoantennae Made by Nature   Most of our current understanding of mechanisms of photosynthesis comes from
spectroscopy. However, classical definition of radio-antenna can be extended to
optical regime to discuss the function of light-harvesting antennae. Further to
our previously proposed model of a loop antenna we provide several more
physical explanations on considering the non-reciprocal properties of the light
harvesters of bacteria. We explained the function of the non-heme iron at the
reaction center, and presented reasons for each module of the light harvester
being composed of one carotenoid, two short $\alpha$-helical polypeptides and
three bacteriochlorophylls; we explained also the toroidal shape of the light
harvester, the upper bound of the characteristic length of the light harvester,
the functional role played by the long-lasting spectrometric signal observed,
and the photon anti-bunching observed. Based on these analyses, two mechanisms
might be used by radiation-durable bacteria, {\it Deinococcus radiodurans}; and
the non-reciprocity of an archaeon, {\it Haloquadratum walsbyi}, are analyzed.
The physical lessons involved are useful for designing artificial light
harvesters, optical sensors, wireless power chargers, passive super-Planckian
heat radiators, photocatalytic hydrogen generators, and radiation protective
cloaks. In particular it can predict what kind of particles should be used to
separate sunlight into a photovoltaically and thermally useful range to enhance
the efficiency of solar cells.

30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin