Coplanar cavity for strong coupling between photons and magnons in van der Waals antiferromagnet

Mandal, Supriya; Kapoor, Lucky N.; Ghosh, Sanat; Jesudasan, John; Manni, Soham; Thamizhavel, A.; Raychaudhuri, Pratap; Singh, Vibhor; Deshmukh, Mandar M.

doi:10.1063/5.0029112

Cited by 19 publications

(9 citation statements)

References 53 publications

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“…More broadly, the mechanism we discuss can easily be generalized to other kinds of magnetic systems. Perhaps some of the more interesting candidates would be various realizations of spin-liquids in strongly-correlated materials [9,14,53,190,207,250,251], iridate compounds with large spin-orbit interactions [126,[252][253][254], electron-doped cuprates [255][256][257][258][259], or two-dimensional van der Waals materials [26,142,148,172,175,187,260]. Generically, we find that the cavity coupling is qualitatively enhanced by large spin-orbit interactions, and also in the presence of bilayer unit cells, which naturally lead to the above candidates.…”

Section: Discussionmentioning

confidence: 72%

“…In the section above, we outline one possible way to generate the necessary field gradient-however, we emphasize that the scheme proposed above is only one of many potential ways this may be done. Other promising routes may involve making smaller split-ring resonators with larger fringing fields, using wave-guide based modes [83,142], plasmonic nanocavities [224], or employing photonic crystal metamaterials [175].…”

Section: Bilayer-rashba Modelmentioning

confidence: 99%

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Cavity magnon-polaritons in cuprate parent compounds

Curtis,

Grankin,

Poniatowski

et al. 2021

Preprint

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Cavity control of quantum matter may offer new ways to study and manipulate many-body systems. A particularly appealing idea is to use cavities to enhance superconductivity, especially in unconventional or high-Tc systems. Motivated by this, we propose a scheme for coupling Terahertz resonators to the antiferromagnetic fluctuations in a cuprate parent compound, which are believed to provide the glue for Cooper pairs in the superconducting phase. First, we derive the interaction between magnon excitations of the Neél-order and polar phonons associated with the planar oxygens. This mode also couples to the cavity electric field, and in the presence of spin-orbit interactions mediates a linear coupling between the cavity and magnons, forming hybridized magnon-polaritons. This hybridization vanishes linearly with photon momentum, implying the need for near-field optical methods, which we analyze within a simple model. We then derive a higher-order coupling between the cavity and magnons which is only present in bilayer systems, but does not rely on spin-orbit coupling. This interaction is found to be large, but only couples to the bimagnon operator. As a result we find a strong, but heavily damped, bimagnon-cavity interaction which produces highly asymmetric cavity line-shapes in the strong-coupling regime. To conclude, we outline several interesting extensions of our theory, including applications to carrier-doped cuprates and other strongly-correlated systems with Terahertz-scale magnetic excitations.

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Section: Discussionmentioning

confidence: 72%

Section: Bilayer-rashba Modelmentioning

confidence: 99%

Cavity magnon-polaritons in cuprate parent compounds

Curtis,

Grankin,

Poniatowski

et al. 2021

Preprint

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show abstract

“…This essentially means that when we aim to probe spin dynamics of 2D vdW monolayers (which are typically µm sized flakes) using microwave photons, the photon mode must have a correspondingly small mode size to maximize the coupling strength and hence its sensitivity. One of the promising approaches to this is to use on-chip superconducting (SC) resonators [176,186,187]. Strong coupling between photons in SC resonators and magnons in anti-ferromagnetic CrCl 3 bulk systems has been demonstrated [186,187].…”

Section: Magnon-photon Coupling Probed In a Superconducting Resonatormentioning

confidence: 99%

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Tang¹,

Alahmed²,

Mahdi³

et al. 2023

Preprint

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The discovery of atomic monolayer magnetic materials has stimulated intense research activities in the two-dimensional (2D) van der Waals (vdW) materials community. The field is growing rapidly and there has been a large class of 2D vdW magnetic compounds with unique properties, which provides an ideal platform to study magnetism in the atomically thin limit. In parallel, based on tunneling magnetoresistance and magneto-optical effect in 2D vdW magnets and their heterostructures, emerging concepts of spintronic and optoelectronic applications such as spin tunnel field-effect transistors and spin-filtering devices are explored. While the magnetic ground state has been extensively investigated, reliable characterization and control of spin dynamics play a crucial role in designing ultrafast spintronic devices. Ferromagnetic resonance (FMR) allows direct measurements of magnetic excitations, which provides insight into the key parameters of magnetic properties such as exchange interaction, magnetic anisotropy, gyromagnetic ratio, spin-orbit coupling, damping rate, and domain structure. In this review article, we present an overview of the essential progress in probing spin dynamics of 2D vdW magnets using FMR techniques. Given the dynamic nature of this field, we focus mainly on the broadband FMR, optical FMR, and spin-torque FMR, and their applications in studying prototypical 2D vdW magnets including CrX3 (X = Cl, Br, I), Fe5GeTe2, and Cr2Ge2Te6. We conclude with the recent advances in laboratory-and synchrotron-based FMR techniques and their opportunities to broaden the horizon of research pathways into atomically thin magnets.

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“…Magnons or magnon polaritons have been observed in magnetic vdW materials, but it had been restricted to either to the optical frequency range 6,7 or a large thickness limit 24,25 , respectively. Here, we address directly the challenge of detecting spin dynamics in ultra-thin vdW magnetic materials and the creation of MPs by magnon-photon coupling in the microwave frequency range, using superconducting resonators optimized for increased magnon-photon coupling.…”

mentioning

confidence: 99%

Probing spin dynamics of ultra-thin van der Waals magnets via photon-magnon coupling

Zollitsch¹,

Khan²,

Nam³

et al. 2022

Preprint

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Layered van der Waals (vdW) magnets can maintain a magnetic order even down to the single-layer regime 2,3,9 and hold promise for integrated spintronic devices 4,5 . While the magnetic ground state of vdW magnets was extensively studied, key parameters of spin dynamics, like the Gilbert damping, crucial for designing ultra-fast spintronic devices, remains largely unexplored. Despite recent studies covering the optical frequency range 6,7 , achieving spin wave control at microwave frequencies is highly desirable, a regime where modern integrated information technologies predominantly operate 8,9 . The intrinsically small numbers of spins, however, poses a major challenge to this. Here, we present a novel approach to detect spin dynamics mediated by photon-magnon coupling between high-Q superconducting resonators and ultrathin flakes of Cr 2 Ge 2 Te 6 (CGT) as thin as 11 nm. We test and benchmark our technique with 23 individual CGT flakes and extract an upper limit for the Gilbert damping parameter. These results are crucial in designing on-chip integrated circuits using vdW magnets and offer prospects for probing spin dynamics of monolayer vdW magnets.van der Waals (vdW) materials 5,10,11 consist of individual atomic layers bonded by vdW forces and can host different types of collective excitations such as plasmons, phonons and magnons. Strong coupling between these excitation modes and electromagnetic waves (i.e. photonic modes) creates confined light-matter hybrid modes, termed polaritons. Polaritons in vdW materials are an ideal model system to explore a variety of polaritonic states 12,13 , e.g. surface plasmon polaritons in graphene 14,15 and exciton polaritons in a monolayer MoS 2 embedded inside a dielectric microcavity 16 . These states can be further modified by electrostatic gating, as well as by hetero-structuring with dissimilar vdW layers.

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Coplanar cavity for strong coupling between photons and magnons in van der Waals antiferromagnet

Cited by 19 publications

References 53 publications

Cavity magnon-polaritons in cuprate parent compounds

Cavity magnon-polaritons in cuprate parent compounds

Ferromagnetic Resonance in Two-dimensional van der Waals Magnets: A Probe for Spin Dynamics

Probing spin dynamics of ultra-thin van der Waals magnets via photon-magnon coupling

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