High-frequency acoustic-phonon generation by heated electrons in parabolic-quantum-well wires in tilted magnetic fields

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Abstract
We present a detailed theoretical study on high-frequency acoustic- (AC-) phonon generation from a GaAs-based parabolic-quantum-well (PQW) wire system in strong magnetic fields. A situation where the magnetic field is applied perpendicular to the quantum wire but at an angle to the confining potential of the one-dimensional electron gas is taken into account. The frequency and angular distribution of AC-phonon emission has been studied through calculating the electron-energy-loss rate in this configuration. The results obtained from this study indicate that: (1) in the presence of tilted magnetic fields, a PQW wire is a system in which the electron energy spectrum is independent of the angle in which the magnetic field is applied; (2) the frequencies of the AC phonons generated are around and depend weakly on the strength and angle of the magnetic field; (3) the AC-phonon generation can be markedly enhanced by magnetic fields over all angle regimes; and (4) the AC-phonon emission in tilted magnetic fields has a different dependence on the phonon emission angle from that at zero magnetic field.