Spin-Flip Transitions Induced by Time-Dependent Electric Fields in Surfaces with Strong Spin-Orbit Interaction

被引：20

作者：

Ibanez-Azpiroz, Julen ^{[1
,2
]}

Eiguren, Asier ^{[1
,2
]}

Sherman, E. Ya. ^{[3
,4
]}

Bergara, Aitor ^{[1
,2
,5
]}

机构：

[1] Univ Basque Country UPV EHU, Bilbao 48080, Euskal Herria, Spain

[2] DIPC, Donostia San Sebastian 20018, Spain

[3] Univ Basque Country UPV EHU, Dept Phys Chem, Bilbao 48080, Euskal Herria, Spain

[4] IKERBASQUE Basque Fdn Sci, Bilbao 48011, Bizkaia, Spain

[5] Ctr Mixto CSIC UPV EHU, CFM, MPC, Donostia San Sebastian 20018, Basque Country, Spain

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 15期

关键词：

STATE;

D O I：

10.1103/PhysRevLett.109.156401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a comprehensive theoretical investigation of the light absorption rate at a Pb/Ge(111) - beta root 3 x root 3R30 degrees surface with strong spin-orbit coupling. Our calculations show that electron spin-flip transitions cause as much as 6% of the total light absorption, representing 1 order of magnitude enhancement over Rashba-like systems. Thus, we demonstrate that a substantial part of the light irradiating this nominally nonmagnetic surface is attenuated in spin-flip processes. Remarkably, the spin-flip transition probability is structured in well-defined hot spots within the Brillouin zone, where the electron spin experiences a sudden 90 degrees rotation. This mechanism offers the possibility of an experimental approach to the spin-orbit phenomena by optical means.

引用

页数：5

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