Plasmons in a Square of Two-Dimensional Electrons

Abstract

Microwave absorption spectra of a single square of two-dimensional electrons (2DES) have been investigated using an optical detection technique. Fundamental dipole and harmonic quadrupole plasmon modes have been identified and compared to those in the disk geometry. In the square-shaped 2DES, a strong interaction is discovered between the neighboring plasmon modes, whereas no such hybridization is observed in the disk-shaped geometry. We establish a rigid theoretical platform to analytically describe the magneto-optical response of confined two-dimensional systems. The developed theory provides a proper description of the obtained experimental results.

References in corpus (2)

• Perturbation theory for two-dimensional hydrodynamic plasmons
• Thresholdless excitation of edge plasmons by transverse current

Cited by in corpus (3)

• Fully screened two-dimensional magnetoplasmons and rotational gravity shallow water waves in a rectangle
• Reduction of fully screened magnetoplasmons in a laterally confined anisotropic two-dimensional electron system to an isotropic one
• Identification of dark axisymmetric plasma modes in partially gated two-dimensional electron gas disk