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http://hdl.handle.net/1843/51572| Type: | Artigo de Periódico |
| Title: | Experimental realization of a quaternary bi-chalcogenide topological insulator with smaller effective mass |
| Authors: | Pedro Henrique Rezende Gonçalves Wendell Simões e Silva Luan Calil de Almeida Araújo Igor de Souza Lana Antoniazzi Thais Chagas Peixoto Silva Ângelo Malachias de Souza Edmar Avellar Soares Vagner Eustáquio de Carvalho Douglas Rodrigues Miquita Rogério Magalhães Paniago |
| Abstract: | It is known that Sb2Se3 does not exhibit topological insulator behavior due to its orthorhombic structure. The introduction of a small amount of bismuth and tellurium may change its structure to hexagonal, leading to a stable topological insulator compound. We report here the synthesis and the structural, chemical, and electronic properties of the topological insulator BiSbSe2.5Te0.5. Combining X-ray and electron diffraction measurements, we demonstrate the formation of this stable quaternary hexagonal single crystal. We used X-ray photoelectron spectroscopy to determine quantitatively the exact chemical composition of the sample. The topological insulating behavior is similar to that of other bismuth chalcogenides, as probed by angle-resolved photoemission spectroscopy. A p-type doping, leading to a 0.15 eV shift of the Fermi level was found. This value compensates the intrinsically n-type doping produced by selenium vacancies. We also found a smaller effective mass and a higher electron group velocity for the electrons in the topological states compared with Bi2Se3. |
| Subject: | Isoladores topológicos |
| language: | eng |
| metadata.dc.publisher.country: | Brasil |
| Publisher: | Universidade Federal de Minas Gerais |
| Publisher Initials: | UFMG |
| metadata.dc.publisher.department: | ICX - DEPARTAMENTO DE FÍSICA |
| Rights: | Acesso Restrito |
| metadata.dc.identifier.doi: | https://doi.org/10.1021/acs.jpcc.9b01811 |
| URI: | http://hdl.handle.net/1843/51572 |
| Issue Date: | 2019 |
| metadata.dc.url.externa: | https://pubs.acs.org/doi/10.1021/acs.jpcc.9b01811 |
| metadata.dc.relation.ispartof: | The Journal of Physical Chemistry C |
| Appears in Collections: | Artigo de Periódico |
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