Excitons in few-layer two-dimensional semiconductors: recent experimental developments modeled by continuum models

Date: 22 January 2019

Venue: UAntwerpen, Campus Groenenborger, Room U.247 - Groenenborgerlaan 171 - 2020 Antwerp

Time: 4:00 PM - 5:00 PM

Organization / co-organization: Condensed Matter Theory

Short description: Condensed Matter Theory lecture presented by Prof Andrey Chaves from U.F. Ceara, Brazil

In this talk, I will discuss recent experimental results in the field of opto-electronics in two-dimensional semiconductors. More specifically, I will demonstrate the use of simplified approaches, such as those based on tight-binding and effective mass models, to provide theoretical description of the dependence of the optical gap and the exciton Rydberg series on the number of layers in phosphorene. I will also analyze how the dielectric environment and applied external fields affect the energies of excitonic complexes (excitons and trions) in phosphorene and transition metal dichalcogenides. Finally, similar theoretical models are applied to describe the inter-layer exciton peaks observed in recent photoluminescence experiments on MoS2 / WSe2 van der Waals heterostructures.

Contact email: lucian.covaci@uantwerpen.be

Link: http://cmt.uantwerpen.be