4 papers
Giant Response and Harmonic Generation in Néel-Torque Antiferromagnetic Resonance
Kuangyin Deng, Ran Cheng
We theoretically investigate the resonant and higher order magnetic responses of a collinear antiferromagnet induced by Néel spin-orbit torques (NSOTs). By deriving the dynamical…
Emerging (2+1)D electrodynamics and topological instanton in pseudo-Hermitian two-level systems
Kuangyin Deng, Ran Cheng
We reveal a hidden electrodynamical structure emerging from a general pseudo-Hermitian system that exhibits real spectra. Even when the Hamiltonian does not explicitly d…
Topology-induced symmetry breaking demonstrated in antiferromagnetic magnons on a Möbius strip
Kuangyin Deng, Ran Cheng
We propose a mechanism of topology-induced symmetry breaking, where certain local symmetry preserved by the Hamiltonian is explicitly broken in the eigenmodes of excitation due to…
Visualizing Field-free Deterministic Magnetic Switching of all-van der Waals Spin-Orbit Torque System Using Spin Ensembles in Hexagonal Boron Nitride
Xi Zhang, Jingcheng Zhou, Chaowei Hu +19
Recently, optically active spin defects embedded in van der Waals (vdW) crystals have emerged as a transformative quantum sensing platform to explore cutting-edge materials science…