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arXiv · 2605.11185

Magnetic-field-tunable cyclotron hyperbolic polaritons

Zijian Zhou·Ran Jing·Heng Wang·Lukas Wehmeier·Mengkun Liu·Bing Cheng
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Abstract

Hyperbolic polaritons are conventionally associated with structural anisotropy or phononic Reststrahlen bands. Here, we predict a new class of hyperbolic polaritons arising from magnetic-field-induced cyclotron motion of charge carriers. When a perpendicular magnetic field is applied to high-mobility semimetals, the cyclotron response drives the in-plane dielectric function from metallic- to insulating-like below the cyclotron resonance frequency, while the out-of-plane response remains metallic. This anisotropy creates a hyperbolic dielectric environment that supports field-tunable hyperbolic polaritons. We develop a comprehensive theoretical framework incorporating coupling to other collective excitations and show that these modes can be directly visualized in real space via terahertz near-field nanoscopy. Our work identifies cyclotron motion as a new route to hyperbolic polaritons and establishes a versatile platform for magnetically programmable nanophotonics.

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Zijian Zhou, Ran Jing, Heng Wang, Lukas Wehmeier, Mengkun Liu, Bing Cheng. 2026-05-11. Magnetic-field-tunable cyclotron hyperbolic polaritons. https://arxiv.org/abs/2605.11185

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