RESONANT-TUNNELING OF PLANE, CYLINDRICAL, AND SPHERICAL DOUBLE-BARRIER QUANTUM-WELLS

Resonant tunneling of double-barrier quantum well (DBQW) in plane, cyl indrical, and spherical geometry has been studied by a simple model fo r the first time. Transmission spectrum, current-voltage characteristi c, and bias dependent conductance have been calculated for these struc tures and are found oscillating in the cylindrical and spherical DBQW. Those oscillations are explained by the different coherence of tunnel ing in these geometries. Dependence of the oscillation on the structur es, the materials, and the external fields is discussed.