Editors’ choice in volume 85, issue 2, February 2021 for the thematic issue “New materials and technologies for security systems” is the paper entitled “Novel plasma excitations in partially-gated two-dimensional electron systems” by A.M. Zarezin, P.A. Gusikhin, V.M. Muravev, S.I. Gubarev, I.V. Kukushkin.