Angle-tunable two-photon absorption in twisted graphene systems

被引：5

作者：

Zhou, Chang ^{[1
]}

Feng, Xiaobo ^{[1
,2
,3
]}

Gong, Rui ^{[1
]}

机构：

[1] Yunnan Normal Univ, Sch Phys & Elect Informat, Kunming 650500, Yunnan, Peoples R China

[2] Yunnan Normal Univ, Yunnan Key Lab Optoelect Informat Technol, Kunming 650500, Yunnan, Peoples R China

[3] Yunnan Normal Univ, Key Lab Adv Tech Preparat Renewable Energy Mat, Minist Educ, Kunming 650500, Yunnan, Peoples R China

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2022年 / 140卷

基金：

中国国家自然科学基金;

关键词：

Twisted graphene systems; Two-photon absorption; Twist angle; SCANNING-TUNNELING-MICROSCOPY; MOIRE;

D O I：

10.1016/j.physe.2022.115204

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We theoretically study the two-photon absorption of twisted bilayer, trilayer and double bilayer graphene with Bernal stacking and demonstrate the layer and twist angle dependent two-photon absorption properties based on both the density functional theory calculations and our developed continuum model for small angle range. The expressions of two-photon absorption for above mentioned three twisted graphene layers around Dirac points are obtained. For small rotation angles which are less than 15 degrees, the rotation angle well tunes the two-photon absorption coefficient in terms of the angle-dependent renormalized Fermi velocity.

引用

页数：7

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