Tunable plasmon modes and topological transitions in single- and bilayer semi-Dirac materials

TL;DR

This paper explores how tunable parameters in semi-Dirac materials influence plasmon modes and topological phase transitions, revealing anisotropic spectra and controllable interlayer plasmon phase relations for advanced optoelectronic applications.

Contribution

It introduces a comprehensive analysis of tunable topological transitions in semi-Dirac materials and their impact on plasmonic responses, including the discovery of controllable interlayer plasmon modes.

Findings

Dirac cone emergence enhances plasmon frequency range.

Strong anisotropy in plasmonic spectrum for finite δ.

Controllable phase switching of plasmon modes in bilayer systems.

Abstract

We investigate the plasmonic response of single- and bilayer semi-Dirac materials under the influence of a tunable parameter $\delta$ that governs topological transitions via Dirac cone generation/merging and incorporating band inversion terms. For single-layer systems, we demonstrate that the emergence of Dirac cones leads to an enhanced plasmon frequency range and that the plasmonic spectrum exhibits strong anisotropy, especially for finite $\delta$ and vanishing inversion terms. In the bilayer configurations, we uncover a second plasmon mode whose relative phase, with respect to the first mode, can be actively controlled by rotating the upper layer which impacts the symmetry of the charge oscillations across the layers. This tunability enables switching between in- and out-of-phase plasmonic modes, offering a route toward phase-controlled collective excitations. Our results highlight the potential of semi-Dirac systems for topological plasmonics and interferometric applications in next-generation optoelectronic devices.