COHERENT AND SEQUENTIAL PHOTOASSISTED TUNNELING THROUGH A SEMICONDUCTOR DOUBLE-BARRIER STRUCTURE

We have studied the problem of coherent and sequential tunneling throu gh a double-barrier structure, assisted by light considered to be pres ent all over the structure, i.e., emitter, well, and collector as in t he experimental evidence. By means of a canonical transformation and i n the framework of the time-dependent perturbation theory, we have cal culated the transmission coefficient and the electronic resonant curre nt. Our calculations have been compared with experiments results and t urn out to be in good agreement. Also, the effect on the coherent tunn eling of a magnetic field parallel to the current in the presence of l ight has been considered.