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 CrBr${}_3$ and the moiré pattern stemming from the lattice mismatch with the underlying substrate. The existence of moiré magnons is further confirmed via inelastic quasiparticle interference, showing the appearance of a dispersion pattern correlated with the moiré length scale. Our results provide a direct visualization in real-space of the dispersion of moiré magnons, demonstrating the versatility of moiré patterns in creating emerging many-body excitations.

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• Electrical noise spectroscopy of magnons in a quantum Hall ferromagnet
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• Hamiltonian Learning of Triplon Excitations in an Artificial Nanoscale Molecular Quantum Magnet
• Moiré spintronics: Emergent phenomena, material realization and machine learning accelerating discovery
• Twist-Tuned Magnonic Nanocavity Mode in a Trilayer Moiré Superlattice