Acoustic-Phonon Limited Mobility in Periodically Modulated Quantum Wires

摘要

We investigate acoustic-phonon scattering in quantum wires subject to a periodicpotential along the propagating direction. A technique for modeling the electronic structure of the periodic system is introduced using the imaginary time propagation method. The acoustic-phonon scattering rate is evaluated by taking umklapp processes into account. We found umklapp processes can cause a significant increase in intersubband scattering but is negligible for intrasubband scattering. Overall, the exact treatment of the electron dispersion relation improves the acoustic-phonon limited mobility compared to earlier estimates.