Ultrafast carrier dynamics in semiconductor superlattices are numerically investigated in the presence of a THz field. In particular, when the Bloch type period is shorter, over 1.5 times, than the THz frequency, the carriers have a combined periodic motion with two frequencies, which are a Bloch type frequency due to the strength of the THz field and the applied THz frequency. In other cases, the carriers have a periodic motion with the applied THz frequency. In addition, we observe that the LO-phonon replicas in the energy relaxation of the carriers disappear and that some of the carriers are more slowly relaxed by the broadened distributions due to the THz field.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)