Dynamics and Stability of Lateral Current Density Patterns in Resonant- Tunneling Structures.

摘要

We study lateral current density patterns in a double-barrier resonant tunneling structure with a bistable Z-shaped current-voltage characteristic. It is shown that for a positive load the external circuit provides a positive feedback upon the dynamics of the current pattens. This leads to accelerated motion of lateral switching fronts which switch the device from the low-conductivity to the high-conductivity state. and vice versa. Negative feedback and stabilization of a stationary front can be achieved by implementation of an active external circuit simulating a negative load.