Angle-resolved photoemission spectroscopy study on graphene using circularly polarized light

被引：8
作者：
Hwang, Choongyu [1 ]
机构：
[1] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2014年 / 26卷 / 33期
基金：
新加坡国家研究基金会;
关键词：
graphene; circular dichroism; angle-resolved photoemission spectroscopy;
D O I：
10.1088/0953-8984/26/33/335501
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We have investigated graphene using circularly polarized light via angle-resolved photoemission spectroscopy. We observe that photoelectron intensity rotates around a constant energy contour towards the opposite direction upon changing the chirality of light. Interestingly, the circular dichroism is found to be asymmetric with respect to the Dirac energy, which is not explained by the Berry phase effect (Liu et al 2011 Phys. Rev. Lett. 107 166803). We also report that the energy spectra taken using the light with different chiralities show a finite separation from each other. We discuss possible origins of the unusual circular dichroism observed in graphene.
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页数：5
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