31. 05. 2023
Ultrafast plasma expansion
In colaboration with the Institute of Physics of the Academy of Sciences of the Czech Republic, we observed an unexpectedly rapidly expanding electron-hole plasma.
In the terhertz laboratory of the Institute of Physics of the Academy of Sciences of the Czech Republic, Petr Kužel's group observed a rapidly expanding electron-hole plasma in a GaAs crystal. The speed of expansion varied depending on the temperature of the crystal and reached up to 0.03 the speed of light, which for the electrons in the crystal is a speed well above the limit given by the crystal structure. In our division, Tomáš Ostatnicky's theoretical group managed to propose a transport model based on the idea of "teleportation" of electron-hole pairs through their recombination and subsequent reabsorption of photons deeper in the crystal. We verified the validity of the model computationally and the results of the work were published in Physical Review Letters.
