ERC No. 787515

Hubmann, S., Gebert, S., Budkin, G. V., Bel'kov, V. V., Ivchenko, E. L., Dmitriev, A. P., Baumann, S., Otteneder, M., Ziegler, J., Disterheft, D., Kozlov, D. A., Mikhailov, N. N., Dvoretsky, S. A., Kvon, Z. D., Weiss, Dieter and Ganichev, S. D. (2019) High-frequency impact ionization and nonlinearity of photocurrent induced by intense terahertz radiation in HgTe-based quantum well structures. Phys. Rev. B 99, 085312.