Electronic and optical properties of phosphorene quantum dots under electric and magnetic fields

Date: 1 February 2017

Venue: Campus Groenenborger, Building U, Room 241 - Groeneborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger)

Time: 4:00 PM - 5:00 PM

Organization / co-organization: Condensed Matter Theory

Short description: CMT seminar presented by Dr Longlong Li

Recently, phosphorene, a single layer of black phosphorus, has drawn interest and attention from the research community. In this talk, we will present the electronic and optical properties of phosphorene quantum dots (PQDs) in the presence of electric and magnetic fields. The energy spectra and wave functions of PQDs are obtained numerically using the tight-binding approach. We find edge states within the band gap of the PQD, which are well separated from bulk states in the PQD.

In an undoped RPQD and for in-plane polarized light, we observe three types of optical transitions which are between the bulk states, between the edge and bulk states, and between the edge states. The electric and magnetic fields influence the bulk-to-bulk, edge-to-bulk, and edge-to-edge transitions in different ways. An important result obtained is that the optical absorption spectra of PQDs under electric and magnetic fields can be utilized to determine their band gaps and to identify their edge states.

Contact email: lucian.covaci@uantwerpen.be

Link: http://cmt.uantwerpen.be