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DOE OSTI · 2998484

Long-Lived Population Inversion in Resonantly Driven Excitonic Antiferromagnet

Warshauer, Jacob A. [Boston University, MA (United States)]·Chen, Huyongqing [Boston University, MA (United States)] (ORCID:0000000154432173)·Bustamante Lopez, Daniel Alejandro [Boston University, MA (United States)] (ORCID:0000000300126335)·Tan, Qishuo [Boston University, MA (United States)] (ORCID:0000000258299119)·Tang, Jing [Boston University, MA (United States)]·Ling, Xi [Boston University, MA (United States)]·Hu, Wanzheng [Boston University, MA (United States)] (ORCID:0000000209260760)
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Abstract

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 NiPS 3 , which appears exclusively with resonant pumping at 1.476 eV in the antiferromagnetic state. Furthermore, 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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36 MATERIALS SCIENCE75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYExcitonsOptical conductivityPhotoexcitationPhotoinduced effectStrongly correlated systemsTerahertz spectroscopyTime-resolved infrared spectroscopy

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Warshauer, Jacob A. [Boston University, MA (United States)], Chen, Huyongqing [Boston University, MA (United States)] (ORCID:0000000154432173), Bustamante Lopez, Daniel Alejandro [Boston University, MA (United States)] (ORCID:0000000300126335), Tan, Qishuo [Boston University, MA (United States)] (ORCID:0000000258299119), Tang, Jing [Boston University, MA (United States)], Ling, Xi [Boston University, MA (United States)], Hu, Wanzheng [Boston University, MA (United States)] (ORCID:0000000209260760). 2025-01-02. Long-Lived Population Inversion in Resonantly Driven Excitonic Antiferromagnet. https://doi.org/10.1103/physrevlett.134.016901

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