Excitons and trions in 2D transition metal dichalcogenides

Datum: 29 maart 2017

Locatie: University of Antwerp - Campus Groenenborger - Building U, room U.241 - Groenenborgerlaan 171 - 2020 ANTWERPEN

Tijdstip: 16 - 17 uur

Korte beschrijving: Condensed Matter Theory seminar presented by Matthias Van der Donck



Excitons and trions in 2D transition metal dichalcogenides

Abstract:

We study the electronic and structural properties of excitons and trions in 2D transition metal dichalcogenides using two different methods: i) A few-body model in which we construct the Hamiltonian in the basis formed by all the possible products of single-particle states. We decouple the corresponding stationary Schrödinger equation and solve the resulting differential equation self-consistently. ii) The stochastic variational method (SVM) in which a variational wave function is used which is expanded in a basis of a large number of correlated Gaussians. We find good agreement between the results of both methods as well as with other theoretical works. However, the few-body model is a multi band model whereas the SVM is a single band model. This leads to differences between the two methods when (interband) interactions are strong.

 

 



Contact e-mail: lucian.covaci@uantwerpen.be

Url: http://cmt.uantwerpen.be