Enhanced linear dichroism of flattened-edge black phosphorus nanoribbons

Seixas L.

Enhanced linear dichroism of flattened-edge black phosphorus nanoribbons

Tipo

Artigo

Data de publicação

2022

Periódico

Journal of Physics Condensed Matter

Citações (Scopus)

1

Autores

Seixas L.

Resumo

© 2022 IOP Publishing Ltd.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.

Assuntos Scopus

2d material , Edge state , Electronic and optical properties , Honeycomb lattices , Incident light , Intrinsic anisotropy , Linear dichroism , Linear polarization , Optical absorption , Optical-