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Symmetry
Volume 14
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10.3390/sym14010084
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Article

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

by
Dasol Kim
1,2,†,
Yeon Lee
1,2,†,
Alexis Chacón
1,2 and
Dong-Eon Kim
1,2,*
1
Department of Physics and Center for Attosecond Science and Technology, POSTECH, Pohang 37673, Korea
2
Max Planck POSTECH/KOREA Research Initiative, Pohang 37673, Korea
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Symmetry 2022, 14(1), 84; https://doi.org/10.3390/sym14010084
Submission received: 13 November 2021 / Revised: 14 December 2021 / Accepted: 20 December 2021 / Published: 6 January 2022
(This article belongs to the Section C: Physics)
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Abstract

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.
Keywords: high-order harmonic generation; dipole transition matrix element; inversion symmetry; tight-binding model; hexagonal boron nitride; interlayer coupling high-order harmonic generation; dipole transition matrix element; inversion symmetry; tight-binding model; hexagonal boron nitride; interlayer coupling

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MDPI and ACS Style

Kim, D.; Lee, Y.; Chacón, A.; Kim, D.-E. Effect of Interlayer Coupling and Symmetry on High-Order Harmonic Generation from Monolayer and Bilayer Hexagonal Boron Nitride. Symmetry 2022, 14, 84. https://doi.org/10.3390/sym14010084

AMA Style

Kim D, Lee Y, Chacón A, Kim D-E. Effect of Interlayer Coupling and Symmetry on High-Order Harmonic Generation from Monolayer and Bilayer Hexagonal Boron Nitride. Symmetry. 2022; 14(1):84. https://doi.org/10.3390/sym14010084

Chicago/Turabian Style

Kim, Dasol, Yeon Lee, Alexis Chacón, and Dong-Eon Kim. 2022. "Effect of Interlayer Coupling and Symmetry on High-Order Harmonic Generation from Monolayer and Bilayer Hexagonal Boron Nitride" Symmetry 14, no. 1: 84. https://doi.org/10.3390/sym14010084

APA Style

Kim, D., Lee, Y., Chacón, A., & Kim, D.-E. (2022). Effect of Interlayer Coupling and Symmetry on High-Order Harmonic Generation from Monolayer and Bilayer Hexagonal Boron Nitride. Symmetry, 14(1), 84. https://doi.org/10.3390/sym14010084

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