Momentum-Resolved Spin Dynamics of Bulk and Surface Excited States in the Topological Insulator Bi2Se3

被引：67

作者：

Cacho, C. ^{[1
]}

Crepaldi, A. ^{[2
]}

Battiato, M. ^{[3
]}

Braun, J. ^{[4
]}

Cilento, F. ^{[2
]}

Zacchigna, M. ^{[5
]}

Richter, M. C. ^{[6
,7
]}

Heckmann, O. ^{[6
,7
]}

Springate, E. ^{[1
]}

Liu, Y. ^{[8
]}

Dhesi, S. S. ^{[8
]}

Berger, H. ^{[9
]}

Bugnon, Ph. ^{[9
]}

Held, K. ^{[3
]}

Grioni, M. ^{[9
]}

Ebert, H. ^{[4
]}

Hricovini, K. ^{[6
,7
]}

Minar, J. ^{[4
,10
]}

Parmigiani, F. ^{[2
,11
,12
]}

机构：

[1] STFC Rutherford Appleton Lab, Cent Laser Facil, Harwell OX11 0QX, Berks, England

[2] Elettra Sincrotrone Trieste SCpA, I-34149 Trieste, Italy

[3] Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria

[4] Ludwig Maximilians Univ Munchen, Dept Chem, D-81377 Munich, Germany

[5] CNR, IOM, I-34149 Trieste, Italy

[6] Univ Cergy Pontoise, Lab Phys Matriaux & Surfaces, F-95031 Cergy Pontoise, France

[7] CEA Saclay, DSM, IRAMIS, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

[8] Chilton, Diamond Light Source, Didcot OX110DE, Oxon, England

[9] Ecole Polytech Fed Lausanne, ICMP, CH-1015 Lausanne, Switzerland

[10] Univ W Bohemia, New Technol Res Ctr, Plzen, Czech Republic

[11] Univ Trieste, I-34127 Trieste, Italy

[12] Univ Cologne, Int Fac, D-50937 Cologne, Germany

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 09期

关键词：

PHOTOEMISSION; MANIPULATION; TEXTURE; BI2TE3;

D O I：

10.1103/PhysRevLett.114.097401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The prospect of optically inducing and controlling a spin-polarized current in spintronic devices has generated wide interest in the out-of-equilibrium electronic and spin structure of topological insulators. In this Letter we show that only measuring the spin intensity signal over several orders of magnitude by spin-, time-, and angle-resolved photoemission spectroscopy can provide a comprehensive description of the optically excited electronic states in Bi2Se3. Our experiments reveal the existence of a surface resonance state in the second bulk band gap that is benchmarked by fully relativistic ab initio spin- resolved photoemission calculations. We propose that the newly reported state plays a major role in the ultrafast dynamics of the system, acting as a bottleneck for the interaction between the topologically protected surface state and the bulk conduction band. In fact, the spin- polarization dynamics in momentum space show that these states display macroscopically different temperatures and, more importantly, different cooling rates over several picoseconds.

引用

页数：6

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