Probing of valley polarization in graphene via optical second-harmonic generation

被引：43
|
作者：
Wehling, T. O. [1 ,2 ]
Huber, A. [3 ]
Lichtenstein, A. I. [3 ]
Katsnelson, M. I. [4 ]
机构：
[1] Univ Bremen, Inst Theoret Phys, Otto Hahn Allee 1, D-28359 Bremen, Germany
[2] Univ Bremen, Bremen Ctr Computat Mat Sci, D-28359 Bremen, Germany
[3] Univ Hamburg, Inst Theoret Phys 1, D-20355 Hamburg, Germany
[4] Radboud Univ Nijmegen, Inst Mol & Mat, NL-6525 AJ Nijmegen, Netherlands
来源：
PHYSICAL REVIEW B | 2015年 / 91卷 / 04期
基金：
欧洲研究理事会;
关键词：
MOS2;
D O I：
10.1103/PhysRevB.91.041404
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Valley polarization in graphene breaks inversion symmetry and therefore leads to second-harmonic generation. We present a complete theory of this effect within a single-particle approximation. It is shown that this may be a sensitive tool to measure the valley polarization created, e.g., by polarized light and, thus, can be used for the development of ultrafast valleytronics in graphene.
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页数：4
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