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arXiv · 2604.17479

Quantum higher-spin Hall insulators

Takuto Kawakami·Igor Kuzmenko·Yshai Avishai·Yigal Meir·Masatoshi Sato
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Abstract

We develop a theory of quantum spin Hall insulators with arbitrary spin $J$. Our analysis demonstrates that such systems support $J+\tfrac{1}{2}$ pairs of helical edge modes protected by nontrivial mirror Chern numbers. We establish that the corresponding edge theory is described by a generalized Dirac fermion with higher-order dispersion. These modes produce unique transport responses that are non-linear with voltage. An in-plane magnetic field opens a mass gap in the edge spectrum, and magnetic domain walls host $(J+\tfrac{1}{2})$-fold degenerate bound states characterized by nontrivial winding numbers. Our results extend quantum spin Hall physics to higher-spin systems and suggest possible realizations in ultracold atomic gases.

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Takuto Kawakami, Igor Kuzmenko, Yshai Avishai, Yigal Meir, Masatoshi Sato. 2026-04-19. Quantum higher-spin Hall insulators. https://arxiv.org/abs/2604.17479

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