Two-dimensional plasmon induced by metal proximity

P. A. Gusikhin, V. M. Muravev, A. A. Zagitova, and I. V. Kukushkin, Phys. Rev. Lett. 121, 176804 – Published 25 October 2018.

An electromagnetic plasma mode has been discovered in the hybrid system formed by a highly conductive gate strip placed in proximity to the two-dimensional electron system. The plasmon mode propagates along the gate strip with no potential nodes present in transverse direction. Its spectrum combines characteristic features of both gated and ungated two-dimensional plasmons. The plasma excitation has been found to exhibit anomalously strong interaction with light.