Long-lived population inversion in resonantly driven excitonic antiferromagnet

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. 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.

6 pages, 3 figures. Accepted for publication in Physical Review Letters

References in corpus (23)

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• The magnetic dynamics of NiPS${}_3$
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Cited by in corpus (4)

• Characteristic exciton energy scales in antiferromagnetic NiPS${}_3$
• Revealing the Electronic Structure of van der Waals Antiferromagnetic NiPS${}_3$ through Synchrotron-Based $\mu$-ARPES and Alkali Metal Dosing
• Magnetic Field-Tunable Repulsive Exciton-Exciton Interaction in the van der Waals Antiferromagnet NiPS${}_3$
• Ultrafast Dynamics of Spin-Orbit Entangled Excitons Coupled to Magnetic Ordering in van der Waals Antiferromagnet NiPS3