scholarly journals Effect of Interlayer Coupling and Symmetry on High-Order Harmonic Generation from Monolayer and Bilayer Hexagonal Boron Nitride

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 84
Author(s):  
Dasol Kim ◽  
Yeon Lee ◽  
Alexis Chacón ◽  
Dong-Eon Kim
Keyword(s):  
Harmonic Generation ◽  
Hexagonal Boron Nitride ◽  
Interlayer Coupling ◽  
High Order ◽  
High Order Harmonic Generation ◽  
Optical Process ◽  
High Order Harmonic ◽  
Highly Nonlinear ◽  
Nonlinear Optical Process ◽  
Rich Information

High-order harmonic generation (HHG) is a fundamental process which can be simplified as the production of high energetic photons from a material subjected to a strong driving laser field. This highly nonlinear optical process contains rich information concerning the electron structure and dynamics of matter, for instance, gases, solids and liquids. Moreover, the HHG from solids has recently attracted the attention of both attosecond science and condensed matter physicists, since the HHG spectra can carry information of electron-hole dynamics in bands and inter- and intra-band current dynamics. In this paper, we study the effect of interlayer coupling and symmetry in two-dimensional (2D) material by analyzing high-order harmonic generation from monolayer and two differently stacked bilayer hexagonal boron nitrides (hBNs). These simulations reveal that high-order harmonic emission patterns strongly depend on crystal inversion symmetry (IS), rotation symmetry and interlayer coupling.

scholarly journals Effect of Molecular Charge Asymmetry on Even-to-odd Ratio of High-order Harmonic Generation

2020 ◽  
Vol 30 (3) ◽  
Author(s):  
Kim-Ngan Nguyen-Huynh ◽  
Cam-Tu Le ◽  
Ngoc-Loan Thi Phan ◽  
Hien Thi Nguyen ◽  
Lan-Phuong Tran
Keyword(s):  
Harmonic Generation ◽  
Nuclear Charge ◽  
Charge Asymmetry ◽  
High Order ◽  
Intense Laser ◽  
Charge Ratio ◽  
High Order Harmonic Generation ◽  
Transition Dipole ◽  
High Order Harmonic ◽  
Rich Information

Recently, asymmetric molecules, such as HeH\(_2^+\), CO, OCS, HCl, have been evolved much attention since its rich information in the high-order harmonic generation (HHG), whose ratio of adjacent even and odd harmonics characterizes the asymmetry of molecules. In this paper, we study the dependence of even-to-odd ratio on the asymmetric parameters, in particular, the nuclear-charge ratio, and the permanent dipole, by exploiting a simple but general model of asymmetric molecules \(Z_1Z_2\) subjected to an intense laser pulse. The HHG is simulated by the numerical method of solving the time-dependent Schrödinger equation. We find out that this even-to-odd ratio strongly depends on the nuclear-charge ratio. In particular, the even-to-odd ratio reaches its maximum when the nuclear-charge ratio is about from 0.5 to 0.7. Besides, the dependence on the permanent dipole of the even-to-odd ratio has a non-trivial law. To explain, we calculate the analytical ratio of the transition dipole according to the emission of even and odd harmonics, and this ratio is well consistent with the even-to-odd ratio of the HHG.

Relativistic high-order harmonic generation

2003 ◽  
Vol 50 (3-4) ◽  
pp. 375-386
Author(s):  
D. B. MilosÕeviĆ ◽  
W. Becker
Keyword(s):  
Harmonic Generation ◽  
High Order ◽  
High Order Harmonic Generation ◽  
High Order Harmonic
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