Split-ring plasma resonance in a two-dimensional electron system
Phys. Rev. B 113, 165301 – Published 8 April, 2026
DOI: https://doi.org/10.1103/1hqb-qpyg
Abstract
We investigate the microwave absorption spectra of a split-ring resonator (SRR) based on a high-mobility two-dimensional electron system (2DES) in an AlGaAs/GaAs heterostructure. Introducing a split into the ring-shaped mesa gives rise to an additional plasmon resonance exhibiting strong polarization dependence. The frequency of the split-induced mode displays a negative magnetic-field dependence, while its dispersion is characteristic of one-dimensional plasma excitations. We also address the tunability of the plasmon resonances in the SRR-shaped 2DES.
