TRANSMITTED ACOUSTIC-PHONON DRAG BETWEEN PARALLEL 2-DIMENSIONAL ELECTRON GASES - MONTE-CARLO SIMULATION

We present Monte Carlo (MC) simulation of transmitted acoustic phonon (TAP) drag between barrier-separated two-dimensional (2D) electron gas es in the AlGaAs/GaAs system. Non-equilibrium acoustic phonons emitted by the hot 2D electron gas in the biased GaAs channel travel across t he sample. These phonons are partially absorbed in an unbiased 2D chan nel where they induce a drag current. Simulation includes 2D electron- non-equilibrium acoustic phonon interaction for both deformation-poten tial and piezoelectric coupling. Non-equilibrium phonon distribution i s calculated numerically. TAP drag is simulated at 4.2 K in a multiple quantum well containing equivalent high-mobility 2D electron gases. D rift velocities around 1000 m s-1 are found in the drag channel (2D ga s without outer field), when it is driven by TAP drag from a large num ber (10-50) of 2D electron gases subjected to electric field of 1000 V m-1. TAP drag is mainly due to the deformation-potential coupling.