期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.206803
关键词
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资金
- KAKENHI [20340092, 23340105]
- JSPS
- Department of Education of the Basque Country Government
- University of the Basque Country [IT-366-07]
- Ministerio de Ciencia e Inovacion [FIS2010-19609-C02-00]
- Grants-in-Aid for Scientific Research [23244066, 23340105, 23540371, 11J07303, 22340103, 20340092] Funding Source: KAKEN
The experimental evidence is presented of the topological insulator state in PbBi2Te4. A single surface Dirac cone is observed by angle-resolved photoemission spectroscopy with synchrotron radiation. Topological invariants Z(2) are calculated from the ab initio band structure to be 1;(111). The observed two-dimensional isoenergy contours in the bulk energy gap are found to be the largest among the known three-dimensional topological insulators. This opens a pathway to achieving a sufficiently large spin current density in future spintronic devices.
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