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Creators/Authors contains: "Chen, Huyongqing"

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  1. Free, publicly-accessible full text available December 1, 2026
  2. Free, publicly-accessible full text available July 17, 2026
  3. Van der Waals magnets are an emerging material family for investigating light-matter interactions and spin-correlated excitations. Here, we report the discovery of a photo-induced state with a lifetime of 17 ps in the van der Waals antiferromagnet NiPS3, which appears exclusively with resonant pumping at 1.476 eV in the antiferromagnetic state. The long-lived state comes with a negative photoconductivity, a characteristic optical response of population inversion. Our findings demonstrate a promising pathway to potentially achieve long-lived lasing at terahertz frequencies in reduced dimensions. 
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    Free, publicly-accessible full text available January 2, 2026