Abstract-Magnetopolaron effect on shallow-impurity states in the presence of magnetic and intense terahertz laser fields in the Faraday configuration

Weiyang Wang, B. Van Duppen, M. Van der Donck, and F. M. Peeters

https://journals.aps.org/prb/accepted/6d07dO43Z4211c3b81984d103a35761924e4abf57

The magnetopolaron effect on shallow-impurity states in semiconductors is investigated when subjected simultaneously to a magnetic field and an intense terahertz laser field within the Faraday configuration. We use a time-dependent non-perturbative theory to describe electron interactions. The externally applied fields are exactly included via a laser-dressed interaction potential. Through a variational approach we evaluate the binding energy of the shallow-impurity states. We find that the interaction strength of the laser-dressed Coulomb potential can not only be enhanced but also weakened by varying the two external fields. In this way the binding energy can be tuned by the external fields and red- or blue-shifted with respect to the static binding energy. In the nonresonant polaron region, a novel magnetopolaron correction that includes the effects of photon process is observed. In the resonant polaron region, moreover, the resonant {\color{black}magnetopolaron} effect accompanied by the emission and absorption of a single photon is distinctly observed. This can be modulated to be far away from the reststrahlen band. The intriguing findings of this manuscript can be observed experimentally and, in turn, provide a new way to measure the strength of the electron-phonon interaction.