Spin-polarized surface resonances accompanying topological surface state formation

被引：80

作者：

Jozwiak, Chris ^{[1
]}

Sobota, Jonathan A. ^{[1
,2
,3
,4
]}

Gotlieb, Kenneth ^{[5
]}

Kemper, Alexander F. ^{[6
,7
]}

Rotundu, Costel R. ^{[2
]}

Birgeneau, Robert J. ^{[8
,9
,10
]}

Hussain, Zahid ^{[1
]}

Lee, Dung-Hai ^{[8
,9
]}

Shen, Zhi-Xun ^{[2
,3
,4
]}

Lanzara, Alessandra ^{[8
,9
]}

机构：

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

[2] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, 2575 Sand Hill Rd, 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, Grad Grp Appl Sci & Technol, Berkeley, CA 94720 USA

[6] North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

[7] Lawrence Berkeley Natl Lab, Computat Res Div, Berkeley, CA 94720 USA

[8] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

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

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

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

关键词：

INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; SINGLE DIRAC CONE; INSULATOR; TRANSITION; PHASE;

D O I：

10.1038/ncomms13143

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Topological insulators host spin-polarized surface states born out of the energetic inversion of bulk bands driven by the spin-orbit interaction. Here we discover previously unidentified consequences of band-inversion on the surface electronic structure of the topological insulator Bi2Se3. By performing simultaneous spin, time, and angle-resolved photoemission spectroscopy, we map the spin-polarized unoccupied electronic structure and identify a surface resonance which is distinct from the topological surface state, yet shares a similar spin-orbital texture with opposite orientation. Its momentum dependence and spin texture imply an intimate connection with the topological surface state. Calculations show these two distinct states can emerge from trivial Rashba-like states that change topology through the spin-orbit-induced band inversion. This work thus provides a compelling view of the coevolution of surface states through a topological phase transition, enabled by the unique capability of directly measuring the spin-polarized unoccupied band structure.

引用

页数：7

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