傅立叶格点哈密顿方法研究准一维通道中的单电子输运

Fourier grid Hamiltonian method is applied to calculate the acoustoelectric current induced by surface acoustic wave (SAW) in a quasi-one-dimensional channel defined in a GaAs-AlxGa1-xAs heterostructure by split gate. Using simple models for the electrostatic potential barrier and piezoelectric potential, we obtain the first quantized plateau. Moreover, the role of the parameter , defined as a ratio of piezoelectric potential amplitude to the effective height of electrostatic potential barrier induced by split gate, is also examined during the calculations of the instantaneous ground state energies and the backward tunneling probabilities.