Electro-optical properties of phosphorene quantum dots

TL;DR

This paper investigates the electronic and optical properties of phosphorene quantum dots, highlighting their edge states, tunable absorption features, and differences from graphene quantum dots under external electric fields.

Contribution

It reveals the presence of edge states at the Fermi level in phosphorene quantum dots, which influence their metallic nature and optical absorption properties, regardless of edge morphology.

Findings

Edge states are dispersed around the Fermi level in phosphorene quantum dots.

These edge states induce metallic behavior and low-energy absorption peaks.

External electric fields can tune the optical absorption features.

Abstract

We study electronic and optical properties of single layer phosphorene quantum dots with various shapes, sizes, and edge types (including disordered edges) subjected to an external electric field normal to the structure plane. Compared to graphene quantum dots, in phosphorene clusters of similar shape and size there is a set of edge states with energies dispersed at around the Fermi level. These states make the majority of phosphorene quantum dots metallic and enrich the phosphorene absorption gap with low-energy absorption peaks tunable by the electric field. The presence of the edge states dispersed at around the Fermi level is a characteristic feature that is independent of the edge morphology and roughness.