Confinement in a Double Barrier Structure in the Presence of an Electric   Field
  The effect of electric field on the electron resonant tunnelling into a double barrier structure is studied. We show for particular field strengths an increase of the tunnelling time which leads us to explain the Stark-ladder localization and Bloch oscillations in superlattices and to discuss the quenching of luminescence in multiple quantum wells. 
S.M.A.Nimour, N.Zekri and R.Ouasti (USTO/LEPM Oran Algeria)