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We study the response of low-dimensional semiconductor superlattices tostrong terahertz fields on condition of a strong suppression of inelasticscattering processes of electrons caused by the polar-optical phonons. For ourstudy we employ a balance equations approach which allows investigating theresponse of the superlattices to strong terahertz fields taking account of boththe inelastic and the strongly pronounced elastic scattering of electrons. Ourapproach provides a way to analyze the influence of the Bloch dynamics ofelectrons in a superlattice miniband side by side with the effects of theelectron heating on the magnitude and the frequency dependence of asuperlattice current responsivity in the terahertz frequency band. Our studyshows that the suppression of the inelastic scattering caused either by areduction of the superlattice dimensionality by lateral quantization or by astrong magnetic field application can give rise to a huge enhancement of thecurrent responsivity. This enhancement can be interpreted in terms of the wellpronounced electronic bolometric effect occurring due to the efficient electronheating in the low-dimensional superlattices by the incident terahertz fields.

journal of applied physics

The non-linear terahertz response of hot electrons in low-dimensional  semiconductor superlattices: Suppression of the polar-optical phonon  scattering