Electronic and optical properties of quasi-two-dimensional nano-structutures and exfoliable systems

• Grant number: 13/24253-5
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): March 01, 2014
• Effective date (End): September 30, 2017
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal researcher: Victor Lopez Richard
• Grantee: Diana Mercedes Meneses Gustin
• Home Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated scholarship(s): 16/02065-0 - Carrier transport through photo-gated thin exfoliated dichalcogenide films, BE.EP.DR

Abstract

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.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MENESES-GUSTIN, D.; ULLOA, S. E.; LOPEZ-RICHARD, V. Electron scattering in two-dimensional semiconductors: Contrasting massive Dirac and Schrodinger behavior. Physical Review B, v. 98, n. 12 SEP 6 2018. Web of Science Citations: 1.

PFENNING, ANDREAS; HARTMANN, FABIAN; SOUSA DIAS, MARIAMA REBELLO; CASTELANO, LEONARDO KLEBER; SUESSMEIER, CHRISTOPH; LANGER, FABIAN; HOEFLING, SVEN; KAMP, MARTIN; MARQUES, GILMER EUGENIO; WORSCHECH, LUKAS; LOPEZ-RICHARD, VICTOR. Nanothermometer Based on Resonant Tunneling Diodes: From Cryogenic to Room Temperatures. ACS NANO, v. 9, n. 6, p. 6271-6277, JUN 2015. Web of Science Citations: 15.