arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.09074cond-mat.mes-hall
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高费米能级下双层石墨烯中相干太赫兹辐射诱导的高次谐波产生

Induced by coherent THz-radiation high harmonics generation in bilayer graphene at high Fermi energies

A. G. Ghazaryan, H. H. Matevosyan, Kh. V. Sedrakian

摘要:

研究了高费米能级下AB型双层石墨烯与相干电磁辐射相互作用的非微扰机制中的高次谐波产生过程。在电子的高费米能区中施加的相干低频辐射场排除了增强高谐波速率的带间跃迁。本文发展的带电载流子与强抽运波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。在多光子激发机制下,密度矩阵的Liouville-vonNeumann方程被解析和数值求解。基于数值解,我们研究了任意偏振泵浦光的高次谐波的速率。所得结果表明,双层石墨烯可以作为一种有效的材料,用于产生从太赫兹到中红外频率域的高次谐波,在泵浦波中等强度。

英文摘要:

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 can serve as an effective material for the generation of higher-order harmonics from THz to the mid-IR domain of frequencies at the pump wave moderate intensities.

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