Abstract
It is shown that in a realistic two-dimensional polar semiconductor the irradiation of an electromagnetic field of terahertz frequency may induce a drop of the electron temperature in a rather wide lattice temperature range around 77 K. A magnetic field in Faraday geometry can give rise to the cyclotron resonance of this electron cooling effect: the sensitivity of the temperature response to the terahertz field strength is greatly enhanced when the cyclotron frequency ${\ensuremath{\omega}}_{c}$ of the magnetic field is close to the radiation frequency $\ensuremath{\omega}.$
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