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• W3214554377 abstract "Optical pump-probe experiments carried out in the time domain reveal both the intrinsic low energy dynamics and its connections to higher energy excitations in correlated electron systems. In this work, we propose two microscopic mechanisms for the optical generation of coherent magnetic modes in van der Waals magnets, and derive the corresponding effective light-spin interactions: either through pumping atomic orbital excitations resonantly or via a light-induced Floquet spin Hamiltonian, the ground state of the system is driven out of equilibrium. The subsequent long-time relaxational dynamics can then be probed using, e.g. the magneto-optical Kerr effect or transient grating spectroscopy. As an example, we apply our framework to NiPS$_3$, which is magnetically ordered in the bulk, and is conjectured to realize the XY model in the monolayer limit. Our theory makes explicit how the material's low-energy response depends sensitively on the microscopic details of the light-spin coupling as well as pump fluence, frequency and polarization. For the case of bulk NiPS$_3$, we find quantitative agreement with recent experiments by Afanasiev et al. [Science Advances 7, abf3096 (2021)]. We further propose pump-probe experiments for monolayer NiPS$_3$ and detail how anomalous relaxational behaviour may reveal excitations of a (proximate) BKT phase in a proposed effective XY model." @default.
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• W3214554377 date "2022-04-21" @default.
• W3214554377 modified "2023-09-25" @default.
• W3214554377 title "Ultrafast optical excitation of magnetic dynamics in van der Waals magnets: Coherent magnons and BKT dynamics in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>NiPS</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>" @default.
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• W3214554377 doi "https://doi.org/10.1103/physrevb.105.155138" @default.
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