Massive Dirac fermions and spin physics in an ultrathin film of topological insulator

被引：529

作者：

Lu, Hai-Zhou ^{[1
,2
]}

Shan, Wen-Yu ^{[1
,2
]}

Yao, Wang ^{[1
,2
]}

Niu, Qian ^{[3
]}

Shen, Shun-Qing ^{[1
,2
]}

机构：

[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

[2] Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China

[3] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

来源：

PHYSICAL REVIEW B | 2010年 / 81卷 / 11期

基金：

美国国家科学基金会;

关键词：

PHASE-TRANSITION; QUANTUM-WELLS; HALL; SURFACE; BI2TE3; CONE;

D O I：

10.1103/PhysRevB.81.115407

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study transport and optical properties of the surface states, which lie in the bulk energy gap of a thin-film topological insulator. When the film thickness is comparable with the surface-state decay length into the bulk, the tunneling between the top and bottom surfaces opens an energy gap and form two degenerate massive Dirac hyperbolas. Spin-dependent physics emerges in the surface bands, which are vastly different from the bulk behavior. These include the surface spin Hall effects, spin-dependent orbital magnetic moment, and spin-dependent optical transition selection rule, which allows optical spin injection. We show a topological quantum phase transition where the Chern number of the surface bands changes when varying the thickness of the thin film.

引用

页数：7

共 34 条

[1] Electrically Detected Interferometry of Majorana Fermions in a Topological Insulator [J].

Akhmerov, A. R. ;

Nilsson, Johan ;

Beenakker, C. W. J. .

PHYSICAL REVIEW LETTERS, 2009, 102 (21)

[2] Quantum spin Hall effect and topological phase transition in HgTe quantum wells [J].

Bernevig, B. Andrei ;

Hughes, Taylor L. ;

Zhang, Shou-Cheng .

SCIENCE, 2006, 314 (5806) :1757-1761

[3] Berry curvature, orbital moment, and effective quantum theory of electrons in electromagnetic fields [J].

Chang, Ming-Che ;

Niu, Qian .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2008, 20 (19)

[4] Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3 [J].

Chen, Y. L. ;

Analytis, J. G. ;

Chu, J. -H. ;

Liu, Z. K. ;

Mo, S. -K. ;

Qi, X. L. ;

Zhang, H. J. ;

Lu, D. H. ;

Dai, X. ;

Fang, Z. ;

Zhang, S. C. ;

Fisher, I. R. ;

Hussain, Z. ;

Shen, Z. -X. .

SCIENCE, 2009, 325 (5937) :178-181

[5] Topological insulators in three dimensions [J].

Fu, Liang ;

Kane, C. L. ;

Mele, E. J. .

PHYSICAL REVIEW LETTERS, 2007, 98 (10)

[6] Superconducting proximity effect and Majorana fermions at the surface of a topological insulator [J].

Fu, Liang ;

Kane, C. L. .

PHYSICAL REVIEW LETTERS, 2008, 100 (09)

[7] Probing Neutral Majorana Fermion Edge Modes with Charge Transport [J].

Fu, Liang ;

Kane, C. L. .

PHYSICAL REVIEW LETTERS, 2009, 102 (21)

[8] CHERN NUMBER AND EDGE STATES IN THE INTEGER QUANTUM HALL-EFFECT [J].

HATSUGAI, Y .

PHYSICAL REVIEW LETTERS, 1993, 71 (22) :3697-3700

[9] A topological Dirac insulator in a quantum spin Hall phase [J].

Hsieh, D. ;

Qian, D. ;

Wray, L. ;

Xia, Y. ;

Hor, Y. S. ;

Cava, R. J. ;

Hasan, M. Z. .

NATURE, 2008, 452 (7190) :970-U5

[10] A tunable topological insulator in the spin helical Dirac transport regime [J].

Hsieh, D. ;

Xia, Y. ;

Qian, D. ;

Wray, L. ;

Dil, J. H. ;

Meier, F. ;

Osterwalder, J. ;

Patthey, L. ;

Checkelsky, J. G. ;

Ong, N. P. ;

Fedorov, A. V. ;

Lin, H. ;

Bansil, A. ;

Grauer, D. ;

Hor, Y. S. ;

Cava, R. J. ;

Hasan, M. Z. .

NATURE, 2009, 460 (7259) :1101-1105

← 1 2 3 4 →