This project proposes a sequence of tasks related to the systematic study of the optical response and electronic properties of quasi-two-dimensional semiconductor systems of different compositions that open up possibilities for the electronic structure tuning and for the study of novel optical phenomena. The proposed problems will allow the systematic application of complementary theoretical tools for the characterization of the electronic structure: the K.P method and ab-initio calculations based on the Density Functional Theory. This contribution is part of collaborations with experimental growth and spectroscopy groups that enrich the scope and the potential development of the theoretical challenges: Munich Technical University and University of Arkansas. The theoretical and experimental endeavors cover the study of esfoliated layers of MoS2, with a peculiar electronic structure as a function of width and its effects on the electronic and optical properties are relevant topics for our ongoing collaboration projects. The second quasi-two-dimensional system under consideration will be confined carriers in quantum wells with strong valence band hybridization effects built with GaInAs alloys along various crystal directions. Two main problems will be tackled in this case: (i) The characterization of the electronic structure hybridization affected by the In-content under magnetic fields; (ii) the theoretical simulation of the optical effects due to changes in temperature and the power of the incident light measured with time-resolved photo-luminescence. The proposed topics are not only aimed at obtaining original results but also allowing the candidate to familiarize with fundamental theoretical tools used in the study of solid state physics and its correlation with experimental results of the ongoing collaborations.
News published in Agência FAPESP Newsletter about the scholarship: