Real-Space Observation of Magnon Interaction with Driven Space-Time Crystals

Träger, Nick; Gruszecki, Paweł; Lisiecki, Filip; Groß, Felix; Förster, Jens; Weigand, Markus; Głowiński, Hubert; Kuświk, Piotr; Dubowik, J.; Schütz, Gisela; Krawczyk, Maciej; Gräfe, Joachim

doi:10.1103/physrevlett.126.057201

Cited by 44 publications

(28 citation statements)

References 31 publications

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“…The wavevector is parallel to the previously applied field H DC (which at the same time sets the stripe domain/spin wave channel direction) and its module → k is 51 rad×µm −1 . The imaging of the spin waves at this spatial scale can be reached with X-ray techniques as recently demonstrated [41]. Several origins have been found for explaining nonreciprocity in magnetic multilayers: interfacial-DMI exchange, spin pumping-based nonreciprocal damping, dipolar interactions or superficial anisotropies [42] and the nonreciprocal emission of waves by the antenna [43].…”

Section: Nonreciprocitymentioning

confidence: 97%

Control of Dynamics in Weak PMA Magnets

Álvarez-Prado

2021

Magnetochemistry

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We have recently shown that a hybrid magnetic thin film with orthogonal anisotropies presenting weak stripe domains can achieve a high degree of controllability of its ferromagnetic resonance. This work explores the origin of the reconfigurability through micromagnetic simulations. The static domain structures which control the thin film resonance can be found under a deterministic applied field protocol. In contrast to similar systems reported, our effect can be obtained under low magnetic fields. We have also found through simulations that the spin wave propagation in the hybrid is nonreciprocal: two adjacent regions emit antiparallel spin waves along the stripe domains. Both properties convert the hybrid in a candidate for future magnonic devices at the nanoscale.

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Section: Nonreciprocitymentioning

confidence: 97%

Control of Dynamics in Weak PMA Magnets

Álvarez-Prado

2021

Magnetochemistry

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“…For example, spatial resolution in magnetooptical Kerr effect (MOKE) microscopy is typically restricted to the micrometer scale without the aid of a near-field probe. 51 X-ray magnetic dichroism (XMCD), responsible for many discoveries of nanoscale magnetic dynamics, 15,43,[52][53][54][55][56][57][58][59] can achieve a spatial resolution on the order of ten nanometers, employing imaging beamlines either at synchrotrons with X-ray pulses of tens of picoseconds or longer, 60 or with femtosecond resolution at free-electron lasers 14 and using highharmonic sources. 61 In contrast, XMCD photoemission electron microscopy takes advantage of the spatial resolution of electron imaging.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast electron microscopy for probing magnetic dynamics

et al. 2021

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The spatial features of ultrafast changes in magnetic textures carry detailed information on microscopic couplings and energy transport mechanisms. Electrons excel in imaging such picosecond or shorter processes at nanometer length scales. We review the range of physical interactions that produce ultrafast magnetic contrast with electrons, and specifically highlight the recent emergence of ultrafast Lorentz transmission electron microscopy. From the fundamental processes involved in demagnetization at extremely short timescales to skyrmion-based devices, we show that ultrafast electron imaging will be a vital tool in solving pressing problems in magnetism and magnetic materials where nanoscale inhomogeneity, microscopic field measurement, non-equilibrium behavior or dynamics are involved. Graphic abstract

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“…Many studies were pursued along this direction, with fruitful results, showing the existence of time crystal in driven closed systems as well as in open dynamics, breaking from a continuous to a discrete time translational symmetry . The experimental realization of discrete time crystals was soon realized after its proposal [29][30][31][32][33], as well as the observation of interactions between two time crystals [34] and a real-space observation in magnons systems [35] . More recently, the time-crystalline eigenstate order has been observed on a quantum processor [36].…”

Section: Introductionmentioning

confidence: 99%

Genuine Multipartite Correlations in a Boundary Time Crystal

Lourenço,

Prazeres,

Maciel

et al. 2021

Preprint

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In this work we study genuine multipartite correlations (GMC's) in a boundary time crystal (BTC). Boundary time crystals are nonequilibrium quantum phases of matter in contact to an environment, for which a macroscopic fraction of the many-body system breaks the time-translation symmetry. We analyze both (i) the structure (orders) of GMC's among the subsystems, as well as (ii) their build-up dynamics for an initially uncorrelated state. We find that, in the thermodynamic limit (and only in such a limit), multipartite correlations of all orders grow indefinitely in time in the BTC phase, further displaying a persistent oscillatory behavior around their mean growth. The orders of the correlations show a power-law decaying hierarchy among its k-partitions. Moreover, in the long-time limit the GMC's are shown extensive with the system size, contrasting to the subextensive scaling in the non time-crystal (ferromagnetic) phase of the model. We also discuss the classical and quantum nature of these correlations with basis on multipartite entanglement witnesses, specifically, the analysis of the Quantum Fisher Information (QFI). Both GMC and QFI are able to capture and distinguish the different phases of the model. Our work highlights the genuine many-body properties of these peculiar non-equilibrium phases of matter.

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Real-Space Observation of Magnon Interaction with Driven Space-Time Crystals

Cited by 44 publications

References 31 publications

Control of Dynamics in Weak PMA Magnets

Control of Dynamics in Weak PMA Magnets

Ultrafast electron microscopy for probing magnetic dynamics

Genuine Multipartite Correlations in a Boundary Time Crystal

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