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arXiv · 2610.23013

Transport Signatures of a Kinetically Self-Trapped Nagaoka Polaron

Yusong Xiao·Yuan Wan
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Abstract

Nagaoka polarons are canonical examples of kinetic magnetism. Although their spin structure is well understood, their transport remains unexplored. We compute the dynamical mobility of a single hole in the square-lattice $t$-model using resummation-based quantum Monte Carlo and analytic continuation. Upon cooling, an incoherent Drude-like response gives way to a finite-frequency peak as the dc mobility vanishes. The peak signals an internal mode of a hole confined by its ferromagnetic cloud. Our results establish transport as an incisive probe of polaron formation and kinetic self-trapping.

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Yusong Xiao, Yuan Wan. 2026-10-16. Transport Signatures of a Kinetically Self-Trapped Nagaoka Polaron. https://arxiv.org/abs/2610.23013

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