Photoexcitation in two-dimensional topological insulators - Generating and controlling electron wavepackets in Quantum Spin Hall systemsFabrizio Dolcini and Fausto RossiEur. Phys. J. Special Topics, 227 12 (2018) 1323-1344DOI: https://doi.org/10.1140/epjst/e2018-800067-2