Direct Observation of Magnon-Phonon Strong Coupling in Two-Dimensional Antiferromagnet at High Magnetic Fields

Liu, Sheng; Águila, Andrés Granados del; Bhowmick, Dhiman; Gan, Chee Kwan; Ha, Thu; Prosnikov, M. A.; Sedmidubský, David; Sofer, Zdeněk; Christianen, Peter C. M.; Sengupta, Pinaki; Xiong, Qihua

doi:10.1103/physrevlett.127.097401

Cited by 79 publications

(102 citation statements)

References 55 publications

(79 reference statements)

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“…During the preparation of our manuscript we have learnt about the paper by S. Liu et al [50] which in part reports similar findings.…”

Section: Discussionsupporting

confidence: 53%

Magnon-polarons in van der Waals antiferromagnet FePS3

Vaclavkova,

Palit,

Wyzula

et al. 2021

Preprint

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The hybridization of magnons (spin waves) with phonons, if sufficiently strong and comprising long wavelength excitations, may offer a new playground when manipulating the magnetically ordered systems with light. Applying a magnetic field to a quasi-2D antiferromagnet, FePS3, we tune the magnon-gap excitation towards coincidence with the initially lower-in-energy phonon modes. Hybrid magnon-phonon modes, the magnon polarons are unveiled with demonstration of a pronounced avoided crossing between the otherwise bare magnon and phonon excitations. The magnon polarons in FePS3 are primary traced with Raman scattering experiments, but, as we show, they also couple directly to terahertz photons, what evokes their further explorations in the domain of antiferromagnetic opto-spintronics.

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“…During the preparation of our manuscript we have learnt about the paper by S. Liu et al [50] which in part reports similar findings.…”

Section: Discussionsupporting

confidence: 53%

Magnon-polarons in van der Waals antiferromagnet FePS3

Vaclavkova,

Palit,

Wyzula

et al. 2021

Preprint

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“…The low-temperature Raman scattering response of FePS 3 includes a doubly degenerate antiferromagnetic magnon excitation close to 122 cm −1 identified by both its peculiar temperature dependence 21 , and recently, by its evolution with an applied magnetic field 9,22,23 . The properties of FePS 3 under pressure have been described recently from the viewpoints of X-ray diffraction 24 and of neutron scattering 25 .…”

Section: Resultsmentioning

confidence: 99%

“…In the last fifteen years, microscopic techniques have been implemented in low-temperature and highmagnetic-field environments produced by resistive solenoids, mainly thanks to the development of commercial piezo inertial motors 6 compatible with cryogenic temperature and high magnetic fields, and allowing for sub-micrometer displacements [7][8][9] . This opened the possibility to perform spatially resolved experiments at low temperatures such as magneto-photoluminescence, a) Authors to whom correspondence should be addressed: marieaude.measson@neel.cnrs.fr and clement.faugeras@lncmi.cnrs.fr -reflectance, -Raman scattering, also with time resolution 10 .…”

Section: Introductionmentioning

confidence: 99%

Spatially resolved optical spectroscopy in extreme environment of low temperature, high magnetic fields and high pressure

Breslavetz,

Delhomme,

Pelini

et al. 2022

Preprint

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We present an experimental set-up developed to perform optical spectroscopy experiments (Raman scattering and photoluminescence measurements) with a micrometer spatial resolution, in an extreme environment of low temperature, high magnetic field and high pressure. This unique experimental setup, to the best of our knowledge, allows us to explore deeply the phase diagram of condensed matter systems by tuning independently these three thermodynamic parameters, while monitoring the low-energy excitations (electronic, phononic or magnetic excitations), to spatially map the Raman scattering response or to investigate objects with low dimensions. We apply this technique to bulk FePS 3 , a layered antiferromagnet with a Néel temperature of T ≈ 120 K.

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“…Optically driven collective lattice mode carry therefore tremendous potential for the manipulation of the long-range magnetic order in 2D magnets, in particular considering the well-established possibility to drive such modes fully coherently even with a photon-energy far from their eigenfrequency 17,18 . In this work we experimentally investigate a flake of the van der Waals antiferromagnet FePS 3 , demonstrating the coherent laser-induced excitation of an optical lattice mode, intimately coupled to the long-range magnetic order, since it can be detected only below the ordering temperature and, additionally, it is reported to hybridize with a zone-centre magnon mode, under the application of an external field [19][20][21] .…”

mentioning

confidence: 97%

“…Considering that our experiment was carried on a flake of FePS 3 deposited on a substrate, our results can be scaled down to a coherent THz modulation of the magnetocrystalline anisotropy in thinner flakes, even in the 2D limit, as FePS 3 and MnPS 3 , differently from NiPS 3 , retains the antiferromagnetic order 24 . In view of the phonon hybridisation with zone centre magnons [19][20][21] , applying an external magnetic field to this material can result in photoinducing even coherent phonomagnonic THz dynamics in a 2D antiferromagnet.…”

mentioning

confidence: 99%

Ultrafast coherent THz lattice dynamics coupled to spins in a van der Waals antiferromagnetic flake

Mertens¹,

Mönkebüscher²,

Coronado³

et al. 2021

Preprint

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A coherent THz optical lattice mode is triggered by femtosecond laser pulses in the antiferromagnetic van der Waals semiconductor FePS 3 . The 380 nm thick exfoliated flake was placed on a substrate and laser-driven lattice and spin dynamics were investigated as a function of the excitation photon energy and sample temperature.The pump-probe spectroscopic measurements reveal that the photo-induced phonon is generated by a displacive mechanism. The amplitude of the phononic signal decreases as the sample is heated up to the Néel temperature and vanishes as the phase transition to the paramagnetic phase occurs. This evidence confirms that the excited lattice mode is intimately connected to the long-range magnetic order. Therefore our work discloses a pathway towards a femtosecond coherent manipulation of the magneto-crystalline anisotropy in a van der Waals antiferromagnet. In fact, it is reported that by applying a magnetic field the induced phonon mode hybridizes via the Kittel-mechanism with zone-centre magnons.

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Direct Observation of Magnon-Phonon Strong Coupling in Two-Dimensional Antiferromagnet at High Magnetic Fields

Cited by 79 publications

References 55 publications

Magnon-polarons in van der Waals antiferromagnet FePS3

Magnon-polarons in van der Waals antiferromagnet FePS3

Spatially resolved optical spectroscopy in extreme environment of low temperature, high magnetic fields and high pressure

Ultrafast coherent THz lattice dynamics coupled to spins in a van der Waals antiferromagnetic flake

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