Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced Linear Dichroism of Flattened-Edge Black Phosphorus Nanoribbons   Black phosphorus is a material with an intrinsic anisotropy in electronic and
optical properties due to its puckered honeycomb lattice. Optical absorption is
different for incident light with linear polarization in the armchair and
zigzag directions (linear dichroism). These directions are also used in the
cuts of materials to create black phosphorus nanoribbons. Edges of nanoribbons
usually have small reconstruction effects, with minor electronic effects. Here,
we show a reconstruction of the armchair edge that introduces a new valence
band, which flattens the puckered lattice and increases the linear dichroism
extrinsically in the visible spectrum. This enhancement in linear dichroism is
explained by the polarization selection rule, which considers the parity of the
wave function to a reflection plane. The flattened-edge reconstruction
originates from the inversion of chirality of the P atoms at the edges and
significantly alters the entire optical absorption of the material. The
flattened edges have potential applications in pseudospintronics,
photodetectors and might provide new functionalities in optoelectronic and
photonic devices.

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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
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The categories of this paper are: econ
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
30
The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
1
The categories of this paper are: cs
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The categories of this paper are: atom-ph