Nonlinear resonant tunneling through double degenerate state of quantum well

Tunneling of electrons through a double-barrier system is considered in the approximation of low-transparence barriers taking into account their Coulomb interaction in the inter barrier space (a quantum well).The state of the electrons in the quantum well is supposed to be two-fold degenerated.It is shown that the dependence of the tunneling current on the applied voltage is of a step like character at low temperatures;in the region of small applied bias there is a threshold value.The considered system also has bistability properties