THz stimulated emission at interband transitions in HgTe/CdHgTe quantum wells V.I. Gavrilenko, V.V. Rumyantsev, A.A. Dubinov, S.V. Morozov, N.N. Mikhailov, S.A. Dvoretsky, F. Teppe and C. Sirtori EPJ Web Conf., 195 (2018) 02001 Published online: 23 November 2018 DOI: 10.1051/epjconf/201819502001