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.