2023
DOI: 10.1021/acs.nanolett.3c00417
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Visualization of Moiré Magnons in Monolayer Ferromagnet

Abstract: Two-dimensional magnetic materials provide an ideal platform to explore collective many-body excitations associated with spin fluctuations. In particular, it should be feasible to explore, manipulate, and ultimately design magnonic excitations in two-dimensional van der Waals magnets in a controllable way. Here we demonstrate the emergence of moiré magnon excitations, stemming from the interplay of spin-excitations in monolayer CrBr3 and the moiré pattern arising from the lattice mismatch with the underlying… Show more

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Cited by 11 publications
(4 citation statements)
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“…Here, note that those fabricated homostructures are also capping-layer-free. The lack of capping layers in our method is helpful for surface-sensitive tools, which makes this technique a valuable toolkit for the observations of surface-sensitive physics [35][36][37][38][39]. Therefore, our capping-layer-free technique is expected to facilitate surface-sensitive moiré physics, such as twisted-angle-induced ferroelectricity [40].…”
Section: Clean Vdw Interfacementioning
confidence: 99%
“…Here, note that those fabricated homostructures are also capping-layer-free. The lack of capping layers in our method is helpful for surface-sensitive tools, which makes this technique a valuable toolkit for the observations of surface-sensitive physics [35][36][37][38][39]. Therefore, our capping-layer-free technique is expected to facilitate surface-sensitive moiré physics, such as twisted-angle-induced ferroelectricity [40].…”
Section: Clean Vdw Interfacementioning
confidence: 99%
“…Furthermore, in view of the two-dimensional magnet nature the moiré superstructure also provides a unique path to tailor the exchange coupling periodically, resulting in the moiré magnetism. 10,32) The intriguing shape and interlayer atomic-stacking morphology indicate that the sophisticated hybridization with substrate would alter the growth dynamics, island geometrical structure, moiré pattern, and even the structural phases of the deposited monolayers. An archetypal example is shown in Fig.…”
Section: Low-dimensional Tmhs and Heterostructuresmentioning
confidence: 99%
“…By this approach, the multiple moiré van Hove singularities emerging from the back-folded magnon dispersion are visualized in the CrBr 3 /HOPG moiré system, which exhibits spatial quasiparticle interference patterns suggestive of strongly dispersive moiré magnon band structure. 32) This arresting discovery indicates the feasibility of tailoring the magnetic structure and dynamics via the moiré pattern where the periodically varying local stacking order modifies the various magnetic couplings, and many subtle mechanisms such as the interlayer orbital hybridization, charge transfer, interlayer superexchange, and RKKY screening of the metallic substrate might play a crucial role in determining the lowdimensional magnetism. Two pertinent experimental results are presented in Figs.…”
Section: Unraveling the Low-dimensional Magnetism At The Atomic Scalementioning
confidence: 99%
“…An obviously important task is to develop new techniques for the detection of these charge-neutral quasi-particles. So far, various experimental tools, such as inelastic neutron scattering 1 , 2 , inelastic tunneling spectroscopy 3 , 4 , terahertz spectroscopy 5 , 6 , microwave Brillouin light scattering 7 , 8 , nitrogen-vacancy center 9 , 10 , and superconducting qubits 11 have been used to detect magnons in bulk magnetic materials. However, their detection in device geometries, which is necessary for information processing applications, has remained challenging until very recently.…”
Section: Introductionmentioning
confidence: 99%