Electronic structure of topological materials probed by angle-resolved photoemission spectroscopy
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Universidade Federal de Minas Gerais
Descrição
Tipo
Tese de doutorado
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Membros da banca
Andrés Felipe Santander-Syro
Simone Silva Alexandre
Carolina Parra Gonzalez
Myriano Henriques de Oliveira Junior
Simone Silva Alexandre
Carolina Parra Gonzalez
Myriano Henriques de Oliveira Junior
Resumo
The research in topological materials had been an extensive source for prediction and
observation of new and exotic phenomena at the condensed matter level. During the last
20 years, a variety of new topological phases of matter had emerged. The most prominent
are Topological Insulators and Weyl Semimetals. In this thesis, we used Angle-resolved
Photoemission Spectroscopy to characterize the electronic structure of two topological
materials: the quaternary topological insulator BiSbSe2.5Te0.5 and the topological Weyl
semimetal candidate TaTe4. We reported the realization of a stable quaternary topological
insulator, BiSbSe2.5Te0.5, characterized by a positive doping and charge carriers with smaller
effective mass when compared with Bi2Se3. About TaTe4, we report a 2D Fermi surface
composed by four Dirac/Weyl cones in the surface first Brillouin zone. The electronic
structure of these metallic states is compatible with previous findings in the literature,
showing a coexistence of CDW and topological features in a 2D Fermi surface.
Abstract
Assunto
Estrutura eletrônica, Semimetais, Fotoemissão, Ondas de densidade de carga
Palavras-chave
Topological insulators, Weyl semimetals, Charge-density waves, Angle-resolved photoemission spectroscopy