Quantum Metric Nonlinear Spin-Orbit Torque Enhanced by Topological Bands
arxiv(2024)
摘要
Effects manifesting quantum geometry have been a focus of physics research.
Here, we reveal that quantum metric plays a crucial role in nonlinear electric
spin response, leading to a quantum metric spin-orbit torque. We argue that
enhanced quantum metric can occur at band (anti)crossings, so the nonlinear
torque could be amplified in topological metals with nodal features close to
Fermi level. By applying our theory to magnetic Kane-Mele model and monolayer
CrSBr, which feature nodal lines and Weyl points, we demonstrate that the
quantum metric torque dominates the response, and its magnitude is
significantly enhanced by topological band structures, which even surpasses the
previously reported linear torques and is sufficient to drive magnetic
switching by itself.
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