Widespread spin polarization effects in photoemission from topological insulators

被引：105

作者：

Jozwiak, C. ^{[1
]}

Chen, Y. L. ^{[1
,2
,3
,4
]}

Fedorov, A. V. ^{[1
]}

Analytis, J. G. ^{[2
,3
,4
]}

Rotundu, C. R. ^{[5
]}

Schmid, A. K. ^{[5
]}

Denlinger, J. D. ^{[1
]}

Chuang, Y-D ^{[1
]}

Lee, D-H ^{[5
,6
]}

Fisher, I. R. ^{[2
,3
,4
]}

Birgeneau, R. J. ^{[5
,6
,7
]}

Shen, Z-X ^{[2
,3
,4
]}

Hussain, Z. ^{[1
]}

Lanzara, A. ^{[5
,6
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[2] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA

[3] Stanford Univ, Geballe Lab Adv Mat, Dept Phys, Stanford, CA 94305 USA

[4] Stanford Univ, Geballe Lab Adv Mat, Dept Appl Phys, Stanford, CA 94305 USA

[5] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[6] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[7] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 16期

关键词：

SINGLE DIRAC CONE; NORMAL EMISSION; RESOLVED PHOTOEMISSION; UNPOLARIZED LIGHT; EXPERIMENTAL-VERIFICATION; PHOTOELECTRONS; ELECTRONS; SURFACE; RADIATION; PT(110);

D O I：

10.1103/PhysRevB.84.165113

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-resolution spin-and angle-resolved photoemission spectroscopy (spin-ARPES) was performed on the three-dimensional topological insulator Bi2Se3 using a recently developed high-efficiency spectrometer. The topological surface state's helical spin structure is observed, in agreement with theoretical prediction. Spin textures of both chiralities, at energies above and below the Dirac point, are observed, and the spin structure is found to persist at room temperature. The measurements reveal additional unexpected spin polarization effects, which also originate from the spin-orbit interaction, but are well differentiated from topological physics by contrasting momentum and photon energy and polarization dependencies. These observations demonstrate significant deviations of photoelectron and quasiparticle spin polarizations. Our findings illustrate the inherent complexity of spin-resolved ARPES and demonstrate key considerations for interpreting experimental results.

引用

页数：9

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