Automation of a cryogenic system for electro-optical measurements

• Grant number: 16/02085-1
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2016
• End date: May 31, 2017
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Marcio Daldin Teodoro
• Grantee: Izabela Zamboti do Lago
• Host Institution: Centro de Ciências Exatas e de Tecnologia (CCET). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil
• Associated research grant: 13/18719-1 - Electronic carriers dynamics in semiconductor nanostructures, AP.JP

Abstract

This research project is dedicated to the automatization of a helium closed cycle cryostat for the electroluminescence measurements in resonant tunneling diodes and transport measurements in semiconductor nanostructures with the incidence of light. For this, a special cold finger working at cryogenic temperatures, development of a program in Labview for acquisition and automation of electro-optical measurements will be built. Electrical current x voltage transport and electro-optical measurements in the region of resonance will be made as a function of temperature in the range of 8-300 K by the use of the available experimental facilities. Later, the experimental investigations will be initiated in GaAs/AlGaAs tunneling resonant diodes samples by means of the electronic transport, photoluminescence and electroluminescence techniques. The experimental results will be contrasted with theoretical models made by our coworkers from the Semiconductor Nanostructures Group of the Department of Physics - UFSCar. All the topics included along the project, such as, the introduction of the student in optical and transport experimental techniques, learning a modern and robust programming language, as well as the theoretical study of quantum systems with potential barriers, are the ingredients that will complement her theoretical and experimental classes to be taken along the year.