Dual evidence of surface Dirac states in thin cylindrical topological insulator Bi2Te3 nanowires

被引：78
作者：
Tian, Mingliang [1 ,2 ,3 ,4 ]
Ning, Wei [1 ,2 ]
Qu, Zhe [1 ,2 ]
Du, Haifeng [1 ,2 ]
Wang, Jian [3 ,4 ,5 ]
Zhang, Yuheng [1 ,2 ]
机构：
[1] Chinese Acad Sci, High Magnet Field Lab, Hefei 230031, Anhui, Peoples R China
[2] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China
[3] Penn State Univ, Ctr Nanoscale Sci, University Pk, PA 16802 USA
[4] Penn State Univ, Dept Phys, University Pk, PA 16802 USA
[5] Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China
来源：
SCIENTIFIC REPORTS | 2013年 / 3卷
关键词：
BI2SE3; OSCILLATIONS; TRANSPORT; CONE;
D O I：
10.1038/srep01212
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
How the surface state (SS) develops and how the spin transport in a curved cylindrical topological insulator nanowire have attracted theoretical attention recently. However, experimental confirmation for the SS in such a real modeling system still remains insufficient. Here we carried out a systematic comparative study on the cylindrical single-crystal Bi2Te3 nanowires of various diameters, and report unambiguously dual evidence for the Dirac SS. Both the predicted anomalous Aharonov-Bohm (AB) quantum oscillations with a period of h/e in H-// and the 1/2-shifted Shubnikov-de Haas (SdH) oscillations (i.e., gamma = -1/2) in H (perpendicular to) were indentified below 1.4 K. In addition, Altshuler-Aronov-Spivak (AAS)-like oscillations with a period of h/2e and ordinary SdH oscillations with gamma = 0 were also resolved. These data provide clear evidence of coexistence of the nontrivial topological Dirac state and trivial electron state on the surface of topological insulator nanowire.
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页数：7
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