Single Dirac Cone Topological Surface State and Unusual Thermoelectric Property of Compounds from a New Topological Insulator Family

被引:191
作者
Chen, Y. L. [1 ,2 ,3 ]
Liu, Z. K. [1 ,2 ]
Analytis, J. G. [1 ,2 ]
Chu, J. -H. [1 ,2 ]
Zhang, H. J. [1 ,2 ]
Yan, B. H. [1 ,2 ]
Mo, S. -K. [3 ]
Moore, R. G. [1 ]
Lu, D. H. [1 ]
Fisher, I. R. [1 ,2 ]
Zhang, S. C. [1 ,2 ]
Hussain, Z. [3 ]
Shen, Z. -X. [1 ,2 ]
机构
[1] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA
[2] Stanford Univ, Dept Phys & Appl Phys, Geballe Lab Adv Mat, Stanford, CA 94305 USA
[3] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA
关键词
D O I
10.1103/PhysRevLett.105.266401
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Angle resolved photoemission spectroscopy study on TlBiTe2 and TlBiSe2 from a thallium-based ternary chalcogenides family revealed a single surface Dirac cone at the center of the Brillouin zone for both compounds. For TlBiSe2, the large bulk gap (similar to 200 meV) makes it a topological insulator with better mechanical properties than the previous binary 3D topological insualtor family. For TlBiTe2, the observed negative bulk gap indicates it as a semimetal, instead of a narrow-gap semiconductor as conventionally believed; this semimetality naturally explains its mysteriously small thermoelectric figure of merit comparing to other compounds in the family. Finally, the unique band structures of TlBiTe2 also suggest it as a candidate for topological superconductors.
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页数:4
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