Traversal time in an asymmetric double-barrier quantum-well structure

A study of traversal time for asymmetric double-barrier quantum-well structure (DBQWS) is presented. The calculations are self consistent in nature. The analysis shows that traversal time is affected more strongly by the width of the emitter barrier than that of the collector barrier of the structure in the presence of space charge. Bistability in traversal time is observed. Bistability becomes greater if the emitter barrier is made wider than the collector barrier and is explained in terms of space charge developed in the quantum well. However, a wider collector will dominate traversal time at zero bias, especially at eigen energy.>