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Magnetic Quantum Oscillations in In 0.53Ga 0.47As/In 0.52Al 0.48As Multiquantum Well Observed by Millimeter Wave Response

We report on millimeter wave measurements of an In0.53Ga0.47As/In0.52Al0.48As multiquantum well fabricated by gas source molecular beam epitaxy. Transmission experiments with the millimeter waves (16–110 GHz) were carried out as a function of the magnetic field up to 10 T at temperatures down to 0.6 K. The quantum oscillations corresponding to the Shubnikov-de Haas effect are observed in the amplitude and phase of the transmitting waves. The effective mass can be estimated as 0.058m0 for the 1st-subband electron. In spite of a small Fermi energy of 27 meV for the 1st subband, the enhancement of an effective mass is 30% over the bulk band-edge mass of 0.041m0. The large difference originates from the resonant polaron coupling due to a fundamental GaAs-like LO-phonon in addition to the band nonparabolicity of the In0.53Ga0.47As well.