Graphene superlattices in strong circularly polarized fields: Chirality, Berry phase, and attosecond dynamics

被引：18
|
作者：
Kelardeh, Hamed Koochaki [1 ]
Apalkov, Vadym
Stockman, Mark I.
机构：
[1] Georgia State Univ, Ctr Nanoopt CeNO, Atlanta, GA 30303 USA
来源：
PHYSICAL REVIEW B | 2017年 / 96卷 / 07期
基金：
美国国家科学基金会;
关键词：
TOPOLOGICAL INSULATORS; BLOCH BAND; PHOTOEMISSION; GENERATION; ELECTRONS;
D O I：
10.1103/PhysRevB.96.075409
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We propose and theoretically explore states of graphene superlattices with relaxed P and T symmetries created by strong circularly polarized ultrashort pulses. The conduction-band electron distribution in the reciprocal space forms an interferogram with discontinuities related to topological (Berry) fluxes at the Dirac points. This can be studied using time-and angle-resolved photoemission spectroscopy (TR-ARPES). Our findings hold promise for control and observation of ultrafast electron dynamics in topological solids and may be applied to petahertz-scale information processing.
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页数：8
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