Special features of the Fourier spectra of magnetoresistance oscillations in a heavily doped heterostructure

Intermodulation of transverse magnetoresistance oscillations in structures with strong intersubband interaction

“…The strong (up to 50%) Shubnikov-de Haas amplitude-frequency modulation (intermodulation) of oscillations of the transverse magnetoresistance xx ρ is established. As a continuation of [4], we suggest a qualitative interpretation of a dependence of peak amplitudes at combination frequencies on the intersubband interaction intensity. Reasons for different contrasts of intermodulation oscillations in InAs/AlSb and Al x Ga 1-x As structures are discussed.…”

“…The probability of transitions determining the peak amplitudes at F m ± F p depends mainly on the structure and physical conditions, including the temperature and magnetic field (Т and В). The combination frequencies are poorly resolved for the Al x Ga 1-x As heterostructures [4], which results only in asymmetry of the F m peak corresponding to the harmonic at the fundamental frequency. The peaks at F m ± F p for the InAs/AlSb structure have high amplitudes.…”

“…The oscillation intermodulation and peaks at combination frequencies were related to the elastic electron-electron (e-e) and inelastic electron-phonon interactions. In [4] it has been demonstrated that the peaks at combination frequencies are caused by resonant intersubband interaction of electrons.…”