Anomalous transport in an n-type topological insulator ultrathin Bi2Se3 film

被引：45

作者：

Hirahara, Toru ^{[1
]}

Sakamoto, Yusuke ^{[1
]}

Takeichi, Yasuo ^{[2
]}

Miyazaki, Hidetoshi ^{[3
]}

Kimura, Shin-ichi ^{[3
]}

Matsuda, Iwao ^{[2
]}

Kakizaki, Akito ^{[2
]}

Hasegawa, Shuji ^{[1
]}

机构：

[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[2] Univ Tokyo, ISSP, Synchrotron Radiat Lab, Kashiwa, Chiba 2778581, Japan

[3] Natl Inst Nat Sci, Inst Mol Sci, UVSOR Facil, Okazaki, Aichi 4448585, Japan

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 15期

关键词：

SURFACE-STATES; BI2TE3;

D O I：

10.1103/PhysRevB.82.155309

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed in situ spin- and angle-resolved photoemission and ex situ magnetotransport measurements on ultrathin topological insulator Bi2Se3 films. The surface states deviate from a simple isotropic Dirac fermion due to hexagonal warping effects and their spin helical nature has been verified. In addition, the bulk states also cross the Fermi level, showing that the films are actually n doped. However, the temperature dependence of the film resistivity was insulating and saturated below 35 K. Furthermore, the magnetoresistivity changed drastically as the sample was cooled down and showed an anomaly near zero field below 20 K. The possible origin of this peculiar behavior and the nature of the carriers involved are discussed in comparison with the results for nonmetallic bulk samples.

引用

页数：6

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