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Thermoelectricity in quantum matter

Grant number: 24/00554-0
Support Opportunities:Scholarships in Brazil - Scientific Journalism
Effective date (Start): July 01, 2024
Effective date (End): December 31, 2024
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Valentina Martelli
Grantee:Lucas Fernandes Casado de Souza
Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:18/19420-3 - Thermoelectricity and heat transport in topological materials, AP.JP

Abstract

Thermoelectricity is a physical property of a conductive material that allows heat to transform into electricity. Through this property it is possible to develop devices that generate electrical energy from heating. However, applications are limited due to the current poor performance in heat-electricity conversion rate. New strategies must be explored to overcome current limitations. In the context of the JP-FAPESP 2018/19420-3, coordinated by Prof.Martelli, the thermoelectric response of selected quantum materials (topological insulators) is under study. They show the peculiar characteristics of simultaneously having surface and bulk electronic states that emerge due to specific symmetries in the arrangements of atoms in the crystal lattice and the collective effects of correlations among them.The objective of the study is to investigate how manipulating those states (surface vs bulk) has an impact on the behavior of thermal, thermoelectric and electric transport from a fundamental perspective through experiments under extreme conditions, such as studying the evolution of transport properties at low temperatures under the effect of a magnetic or electric field, or when the material approaches 2D. This project aims to bring relevant information about the microscopic organisation from charge carriers and explore new routes to enhance thermoelectric performance. The investigation is carried out through advanced experiments and the platforms ad-hoc developed by collaborators of the group at the LQMEC laboratory (Laboratory for Quantum Matter under Extreme Conditions) In this project of scientific journalism, the students will develop 3 video reports after the training offered by Futura's channel to produce audiovisual material and disseminate the scientific results obtained in the framework of the JP-grant, the activities carried out at the LQMEC laboratory and the training journey of young researchers conducting their research with projects linked to JP: 2018/19420-3. The products will be shared at the laboratory's social media pages at the following addresses: https://www.instagram.com/lqmec_usp/, https://www.tiktok.com/@lqmec, https://www.youtube.com/channel/UCKyORh6exWxEQmUiZubj8DQ beside the publication on the laboratory website: https://lqmec.com/.

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