Polaritons dispersion in a composite ferrite-semiconductor structure near gyrotropic-nihility state

TL;DR

This paper investigates the behavior of polaritons in a ferrite-semiconductor structure under an external magnetic field, identifying a unique gyrotropic-nihility state where certain tensor components vanish, leading to branch merging and anomalous dispersion.

Contribution

It introduces the concept of gyrotropic-nihility in bulk polaritons within ferrite-semiconductor structures and analyzes its effects on polariton dispersion and branch merging.

Findings

Identification of the gyrotropic-nihility state where tensor components vanish.

Observation of branch merging of bulk polaritons near this state.

Discovery of anomalous dispersion of bulk and surface polaritons.

Abstract

In the context of polaritons in a ferrite-semiconductor structure which is influenced by an external static magnetic field, the gyrotropic-nihility can be identified from the dispersion equation related to bulk polaritons as a particular extreme state, at which the longitudinal component of the corresponding constitutive tensor and bulk constant simultaneously acquire zero. Near the frequency of the gyrotropic-nihility state, the conditions of branches merging of bulk polaritons, as well as an anomalous dispersion of bulk and surface polaritons are found and discussed.