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High harmonics generation in bilayer graphene at high Fermi energies induced by coherent THz-radiation
Journal of Nanophotonics ( IF 1.5 ) Pub Date : 2020-11-16 , DOI: 10.1117/1.jnp.14.046009
Armenuhi G. Ghazaryan 1 , Hrant H. Matevosyan 2 , Khachik V. Sedrakian 1
Affiliation  

Abstract. The higher-order harmonic generation process in the nonperturbative regime at the interaction of coherent electromagnetic radiation with the AB-stacked bilayer graphene at high Fermi energies is considered. The applied coherent low-frequency radiation field in the high Fermi energy zone of electrons excludes the interband transitions enhancing high harmonic rates. The developed microscopic nonlinear quantum theory for charged carriers interaction with a strong pump wave is valid near the Dirac points of the Brillouin zone. The Liouville–von Neumann equation for the density matrix in the multiphoton excitation regime is solved both analytically and numerically. Based on the numerical solutions, we examine the rates of higher-order harmonics of the pump wave of arbitrary polarization. Obtained results show that bilayer graphene serves as an effective material for the generation of higher-order harmonics from THz to the mid-IR domain of frequencies at moderate pump wave intensities.

中文翻译:

由相干太赫兹辐射引起的高费米能量双层石墨烯中的高次谐波产生

摘要。考虑了在高费米能量下相干电磁辐射与 AB 堆叠双层石墨烯相互作用的非微扰状态下的高次谐波生成过程。在电子的高费米能区中应用的相干低频辐射场排除了增强高谐波率的带间跃迁。用于带电载流子与强泵浦相互作用的微观非线性量子理论在布里渊区的狄拉克点附近是有效的。多光子激发区密度矩阵的 Liouville-von Neumann 方程得到解析和数值求解。基于数值解,我们检查了任意极化泵浦波的高次谐波率。
更新日期:2020-11-16
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