Remarkable Enhancement of High Harmonic Generation from Superhard Material under High Pressure
Zishao Wang, Tong Wu, Ziwen Wang, Shicheng Liu, Hui Li, Kun Zhao, Jian Sun, Chao Yu, Ruifeng Lu
Abstract
High harmonic generation (HHG) in solids offers a pathway to develop compact extreme ultraviolet (EUV) sources crucial for attosecond science and advanced spectroscopy. Here, we demonstrate theoretically that high pressure dramatically enhances HHG in superhard hexagonal tungsten nitride (h-WN6). Compared with solid-state systems at ambient pressure, the reshaped electronic environment under high pressure leads to a unique band-gap widening in h-WN6, which raises the material's damage threshold, allowing the use of stronger laser fields and enabling access to higher-energy bands. This pressure-induced band-gap widening offers a promising strategy to overcome the cutoff limitation of solid-state EUV light sources.
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