Three modes of the nonstationary holographic current excitation in a gallium oxide crystal M. A. Bryushinin, V. V. Kulikov, A. A. Petrov, I. A. Sokolov, R. V. Romashko and Yu. N. Kulchin EPL, 137 2 (2022) 26002 Published online: 11 April 2022 DOI: 10.1209/0295-5075/ac47f5