Publication

Intrinsic Non-Hermiticity in Photonic Floquet Topological Insulators with Genuine Temporal Modulation

2025

Abstract

Photonic topological insulators (TIs), inspired by condensed matter TIs, exhibit intrinsic non-Hermitian properties due to the Maxwell equation’s nature, particularly in Floquet TIs. This study peeks into these phenomena through a double-laced Floquet Su-SchriefferHeeger (SSH) model, revealing amplified and attenuated topological interface states via microwave experiments leveraging semiconductor varactors’ nonlinearity.

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2025

Abstract

Official source

Related concepts (13)

Maxwell's equations

Maxwell's equations, or Maxwell–Heaviside equations, are a set of coupled partial differential equations that, together with the Lorentz force law, form the foundation of classical electromagnetism, classical optics, and electric circuits. The equations provide a mathematical model for electric, optical, and radio technologies, such as power generation, electric motors, wireless communication, lenses, radar, etc. They describe how electric and magnetic fields are generated by charges, currents, and changes of the fields.

Maxwell's equations in curved spacetime

In physics, Maxwell's equations in curved spacetime govern the dynamics of the electromagnetic field in curved spacetime (where the metric may not be the Minkowski metric) or where one uses an arbitrary (not necessarily Cartesian) coordinate system. These equations can be viewed as a generalization of the vacuum Maxwell's equations which are normally formulated in the local coordinates of flat spacetime.

Spin (physics)

Spin is an intrinsic form of angular momentum carried by elementary particles, and thus by composite particles such as hadrons, atomic nuclei, and atoms. Spin should not be understood as in the "rotating internal mass" sense: spin is a quantized wave property. The existence of electron spin angular momentum is inferred from experiments, such as the Stern–Gerlach experiment, in which silver atoms were observed to possess two possible discrete angular momenta despite having no orbital angular momentum.