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Study of the properties of the topological insulator Bi2Te3 grown by molecular beam epitaxy

Grant number: 16/22366-5
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): March 01, 2017
Effective date (End): February 20, 2018
Field of knowledge:Physical Sciences and Mathematics - Physics
Cooperation agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
Principal Investigator:Eduardo Abramof
Grantee:Celso Israel Fornari
Home Institution: Instituto Nacional de Pesquisas Espaciais (INPE). Ministério da Ciência, Tecnologia, Inovações e Comunicações (Brasil). São José dos Campos , SP, Brazil
Associated research grant:15/16191-5 - The research in new materials involving high magnetic fields and low temperatures, AP.TEM

Abstract

Topological insulators have received great attention of the scientific community due to its unique surface characteristics. These materials behave like conventional insulators in the bulk and have a metallic surface with unique properties, which has been investigated both for technological applications such as quantum computing and spintronics, and for basic scientific research, as in the search of the Majorana fermion. However, these topological properties are extremely sensitive to contamination on the surface, which can modify the crystalline structure leading to degradation of the topological order. Therefore, it is of utmost importance to protect these topological states from contamination in order to use their surface properties at room conditions. This project aims to investigate a protective layer to Bi2Te3 compound to protect the surface states from contamination, while preserving the topological order in the compound. In addition, we will study this topological system by doping with rare earths and by producing vertical p-n junctions. With these new structures, it is expected to suppress free carriers from the bulk, allowing direct measurements through surface channels. This post-doctoral project is included in the thematic project FAPESP Nr. 15/16191-5 and will have collaboration with the group of Experimental Physics VII of the Würzburg University in Germany. (AU)

Scientific publications (5)
(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)
MORELHAO, SERGIO L.; KYCIA, STEFAN W.; NETZKE, SAMUEL; FORNARI, CELSO I.; RAPPL, PAULO H. O.; ABRAMOF, EDUARDO. Dynamics of Defects in van der Waals Epitaxy of Bismuth Telluride Topological Insulators. Journal of Physical Chemistry C, v. 123, n. 40, p. 24818-24825, OCT 10 2019. Web of Science Citations: 0.
FORNARI, I, C.; RAPPL, P. H. O.; MORELHAO, S. L.; FORNARI, G.; TRAVELHO, J. S.; DE CASTRO, S.; PIRRALHO, M. J. P.; PENA, F. S.; PERES, M. L.; ABRAMOF, E. Structural defects and electronic phase diagram of topological insulator bismuth telluride epitaxial films. MATERIALS RESEARCH EXPRESS, v. 5, n. 11 NOV 2018. Web of Science Citations: 3.
MORELHAO, SERGIO L.; KYCIA, STEFAN; NETZKE, SAMUEL; FORNARI, CELSO I.; RAPPL, PAULO H. O.; ABRAMOF, EDUARDO. Hybrid reflections from multiple x-ray scattering in epitaxial bismuth telluride topological insulator films. Applied Physics Letters, v. 112, n. 10 MAR 5 2018. Web of Science Citations: 3.
Improving the Radiopacity of Calcium Aluminate Cement Based Blends. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, n. ahead, p. -, 2018.
DE OLIVEIRA, IVONE REGINA; VIEIRA, GABRIELA DO VALE; DOS SANTOS, KENNEDY WALLACE; RANIERO, LEANDRO JOSE; CASTRO-RAUCCI, LARISSA MOREIRA; DE OLIVEIRA, PAULO TAMBASCO; FORNARI, CELSO ISRAEL; PANDOLFELLI, VICTOR CARLOS. Improving the Radiopacity of Calcium Aluminate Cement Based Blends. MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS, v. 21, n. 2, p. -, 2018. Web of Science Citations: 0.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.