Electro-optical properties of phosphorene quantum dots
Physical Review B: Condensed matter and materials physics
American Physical Society
© 2017 American Physical Society
We study the 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 around the Fermi level is a characteristic feature that is independent of the edge morphology and roughness.
This work was supported by the EU FP7 ITN NOTEDEV (FP7-607521); EU H2020 RISE project CoExAN (H2020-644076); FP7 IRSES projects CANTOR (FP7-612285), QOCaN (FP7-316432), and InterNoM (FP7-612624); and Graphene Flagship (Grant No. 604391).
This is the final version of the article. Available from American Physical Society via the DOI in this record.
Vol. 96, article 085436