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

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 26期

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.

引用

页数：4

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