Sum-Rule Constraints on the Surface State Conductance of Topological Insulators

被引：20

作者：

Post, K. W. ^{[1
]}

Chapler, B. C. ^{[1
]}

Liu, M. K. ^{[1
]}

Wu, J. S. ^{[1
]}

Stinson, H. T. ^{[1
]}

Goldflam, M. D. ^{[1
]}

Richardella, A. R. ^{[2
]}

Lee, J. S. ^{[2
]}

Reijnders, A. A. ^{[3
,4
]}

Burch, K. S. ^{[5
]}

Fogler, M. M. ^{[1
]}

Samarth, N. ^{[2
]}

Basov, D. N. ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[2] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[3] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[4] Univ Toronto, Inst Opt Sci, Toronto, ON M5S 1A7, Canada

[5] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 11期

基金：

美国国家科学基金会;

关键词：

SINGLE DIRAC CONE; TRANSPORT; GRAPHENE; DYNAMICS;

D O I：

10.1103/PhysRevLett.115.116804

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the Drude oscillator strength D and the magnitude of the bulk band gap E-g of the epitaxially grown, topological insulator (Bi, Sb)(2)Te-3. The magnitude of Eg, in conjunction with the model independent -sum rule, allows us to establish an upper bound for the magnitude of D expected in a typical Dirac-like system composed of linear bands. The experimentally observed D is found to be at or below this theoretical upper bound, demonstrating the effectiveness of alloying in eliminating bulk charge carriers. Moreover, direct comparison of the measured D to magnetoresistance measurements of the same sample supports assignment of the observed low-energy conduction to topological surface states.

引用

页数：5

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