Atomic-like high-harmonic generation from two-dimensional materials

Science Advances
Nicolas Tancogne-Dejean, Angel Rubio

Abstract

The generation of high-order harmonics from atomic and molecular gases enables the production of high-energy photons and ultrashort isolated pulses. Obtaining efficiently similar photon energy from solid-state systems could lead, for instance, to more compact extreme ultraviolet and soft x-ray sources. We demonstrate from ab initio simulations that it is possible to generate high-order harmonics from free-standing monolayer materials, with an energy cutoff similar to that of atomic and molecular gases. In the limit in which electrons are driven by the pump laser perpendicularly to the monolayer, they behave qualitatively the same as the electrons responsible for high-harmonic generation (HHG) in atoms, where their trajectories are described by the widely used semiclassical model, and exhibit real-space trajectories similar to those of the atomic case. Despite the similarities, the first and last steps of the well-established three-step model for atomic HHG are remarkably different in the two-dimensional materials from gases. Moreover, we show that the electron-electron interaction plays an important role in harmonic generation from monolayer materials because of strong local-field effects, which modify how the material is ioniz...Continue Reading

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Mar 11, 2017·Physical Review Letters·Nicolas Tancogne-DejeanAngel Rubio
Sep 30, 2017·Nature Communications·Yong Sing YouShambhu Ghimire

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Citations

May 2, 2020·Physical Review Letters·Lun Yue, Mette B Gaarde
Mar 23, 2019·Nature Communications·N KlemkeO D Mücke
Feb 19, 2021·ACS Nano·Derek S WangPrineha Narang
Aug 31, 2021·ACS Nano·Derek S WangJohannes Flick
Jun 28, 2018··Hamed Merdji, Hamed Merdji

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