Forming of current instabilities in triple-barrier quantum structures under strong HF electric field

It is found an exact analytical steady-state solution of the self consistent time-dependence Schrodinger and Poisson equations at resonance conditions in asymmetric triple- barrier structures in the electric field of finite amplitude. The solution is defined by three order polynomial equation for uniform electron distribution and five order equations for monoenergetic electron beam. A possible mechanism, which leads to forming of the current instability, is found out. The current oscillation frequency is shown to be function of hf voltage amplitude. Reflection and transmission coefficients and HF conductance are combinations of N and S-type characteristics for uniform electron distribution beams and loop-type characteristic for monoenergetic electron beams