Kavli Affiliate: Jeffrey B. Neaton
| First 5 Authors: Yue Sun, Fanhao Meng, Sijia Ke, Kun Xu, Hongrui Zhang
| Summary:
We identify a "twin-twist" angle in orthorhombic two-dimensional magnets that
maximizes interlayer orbital overlap and enables strong interfacial coupling.
Focusing on the van der Waals antiferromagnet CrSBr, we show that this twist
angle, near 72 deg, aligns diagonal lattice vectors across the layers,
enhancing the interlayer hopping that is spin-forbidden in pristine systems and
orbital-forbidden in 90-deg-twisted samples. The enhanced hopping modifies the
electronic structure and activates a novel mechanism for excitation of
interfacial magnons. Using optical probes we discover that excitons on one side
of the interface selectively excite magnons localized on the opposite side. We
show that this cross-coupling phenomenon can be understood as a consequence of
the spin-transfer torque as that arises as electrons tunnel across the
twin-twisted interface. Our findings demonstrate that large-angle twisting in
anisotropic 2D materials offers a powerful tool for engineering spin and charge
transport through controlled interlayer hybridization, opening new avenues for
twisted magnetism and strongly correlated moir’e physics.
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