Abstract
Energy splitting ΔE res in double magnetopolaron energy spectrum in rectangular quantum wells as functions of the well width d have been calculated. We have considered in the capacity of interaction leading to resonant coupling between electrons and phonons the interaction with confined phonons and (for comparison) with bulk LO phonons. We have obtained the conditions when the interaction with bulk phonons yields correct results. Calculations for AlAs/GaAs/AlAs and AlSb/InSb/AlSb structures have been performed. Alongside the parameter ΔE res for a polaron, whose resonant magnetic field is determined by the condition Ω=ω L1, where Ω is the cyclotron frequency and ω L1 is the LO phonon frequency in the quantum well (A-polaron), we have calculated ΔE res for D-(Ω=2ω L1) and F-polarons (Ω=3ω L1), which is a factor of \(\sqrt 2 \) and \(\sqrt 3 \), respectively, smaller than ΔE res for the A-polaron. Since the splitting ΔE res for the A-polaron is very large (up to 0.2ℏω L1), it is more convenient to study in experiments D-and F-polarons since their resonant magnetic fields are lower. We have predicted existence of “weak” magnetopolarons, in which the splitting is proportional to a higher power of Frölich’s coupling constant α than α 1/2.
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Zh. Éksp. Teor. Fiz. 115, 187–204 (January 1999)
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Korovin, L.I., Lang, I.G. & Pavlov, S.T. Magnetopolaron states involving confined phonons in a semiconductor quantum well. J. Exp. Theor. Phys. 88, 105–113 (1999). https://doi.org/10.1134/1.558771
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DOI: https://doi.org/10.1134/1.558771