Quantum Interference in Macroscopic Crystals of Nonmetallic Bi2Se3

被引：338

作者：

Checkelsky, J. G. ^{[1
]}

Hor, Y. S. ^{[2
]}

Liu, M. -H. ^{[1
]}

Qu, D. -X. ^{[1
]}

Cava, R. J. ^{[2
]}

Ong, N. P. ^{[1
]}

机构：

[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[2] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 24期

基金：

美国国家科学基金会;

关键词：

UNIVERSAL CONDUCTANCE FLUCTUATIONS; MAGNETIC-FLUX QUANTIZATION; TOPOLOGICAL-INSULATOR; MAGNETORESISTANCE; TEMPERATURE; H/E;

D O I：

10.1103/PhysRevLett.103.246601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Photoemission experiments have shown that Bi2Se3 is a topological insulator. By controlled doping, we have obtained crystals of Bi2Se3 with nonmetallic conduction. At low temperatures, we uncover a novel type of magnetofingerprint signal which involves the spin degrees of freedom. Given the mm-sized crystals, the observed amplitude is 200-500x larger than expected from universal conductance fluctuations. The results point to very long phase-breaking lengths in an unusual conductance channel in these nonmetallic samples. We discuss the nature of the in-gap conducting states and their relation to the topological surface states.

引用

页数：4

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