Author

Shuntaro Sumita

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Preprint Sep 2026

Density-matrix quantum kinetics of spin-mode crossover and ac Edelstein response in spin--orbit-coupled chiral metals

To clarify spin relaxation and precession across the weak-to-strong SOC crossover in chiral conductors, we formulate a density-matrix quantum kinetic theory for a three-dimensional isotropic chiral metal with hedgehog SOC and nonmagnetic impurity scattering. The formulation retains interband coherence, and its collisio...

Shuntaro Sumita, Y. Kato · 0 citations

Preprint Aug 2026

Theory of Magnetic Excitations in the Heavy-Fermion Spin-Triplet Superconductor UTe$_2$

We study the dynamical spin response of UTe$_2$ by using a mixed-dimensional periodic Anderson model. Within the BCS-RPA formalism, we examine how the $f$-orbital character of the quasiparticles affects magnetic excitations in both the normal and superconducting (SC) states. In the normal state, finite mixing between l...

Koki Shimura, Shuntaro Sumita, Y. Kato · 0 citations