MULTIPLE SELF-CONSISTENT SOLUTIONS AT ZERO-BIAS AND MULTIPLE CONDUCTION CURVES IN QUANTUM TUNNELING DIODES INCORPORATING N--N-N- SPACER LAYERS()

We report the existence of multiple self-consistent solutions to the c oupled Schrodinger and Poisson equations for diodes that combine a tun neling heterostructure with an unusual N--N+-N- spacer layer scheme. T he solutions give rise to multiple, distinct current-voltage curves th at extend from zero bias. Within the single electron coherent tunnelin g model, we find four distinct self-consistent solutions even at zero bias in a symmetric device based on a double-barrier quantum-well tunn eling structure.