Spectra of the field and current oscillations in superlattices exposed to terahertz laser radiation

Pendulum limit, chaos and phase-locking in the dynamics of ac-driven semiconductor superlattices

“…Strongly nonlinear dynamical effects in miniband semiconductor superlattices (SSLs) driven by an intense highfrequency electric field attract growing interest in the last few years [1,2,3,4,5,6,7,8,9]. This theoretical activity, which includes investigation of dissipative chaos [2,4,6,7] and a spontaneous generation of dc voltage in a purely ac-driven SSL [1,3,4,5,7,8,9,10], has been stimulated by a recent progress in the experimental studies of nonlinear electron transport in the SSLs driven by THz field [11]. On other hand, recent experiments [12] reveal an important role of coherent plasma oscillations in nonlinear dynamics of carriers in SSLs.…”

“…Within the semiclassical approach [23], ac-driven plasma oscillations in a single miniband SSL are described by the set of balance equations for the average electron velocity (current), the average electron energy and the electric field (voltage) generated by an electron motion in SSL [1,2,3,7,8,9]. It has been shown in ref.…”

Electron Bloch oscillations and electromagnetic transparency of semiconductor superlattices in multi-frequency electric fields

“…beyond the sinusoidal miniband dispersion law). Moreover, the internal SL field can contain several frequencies even if the external field is purely harmonic [17,19,22,23]. Our analysis is based on that of Refs.…”

“…This was discussed in details in Refs. [19,[22][23][24].) It could be several possible states resulting in multistability and hysteretic behavior of the dependencies of the generated static field (as well as the current and internal field spectra) on the external field.…”

“…In general case, the SL states in the presence of such field are nonlinear oscillations of the SL current and internal field [17,19,22,23] with the static component present in the spectra. (By the internal field we mean the field which exists in the SL and acts on the SL electrons.…”