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

被引:4
作者
Ghazaryan, Armenuhi G. [1 ]
Matevosyan, Hrant H. [2 ]
Sedrakian, Khachik, V [1 ]
机构
[1] Yerevan State Univ, Ctr Strong Fields Phys, Yerevan, Armenia
[2] Natl Acad Sci Armenia, Inst Radiophys & Elect, Ashtarak, Armenia
关键词
microscopic quantum description; second-order nonlinearities; laser; multiphoton; high harmonic generation; particle-hole; annihilation; density matrix; FIELD; GASES;
D O I
10.1117/1.JNP.14.046009
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
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 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. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)
引用
收藏
页数:15
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