Coherent and sequential photoassisted tunneling through a semiconductor double-barrier structure

Abstract

We have studied the problem of coherent and sequential tunneling through a double barrier structure, assisted by light considered to be present All over the structure, i,e emitter, well and collector as in the experimental evidence.By means of a canonical transformation and in the framework of the time dependent perturbation theory, we have calculated the transmission coefficient and the electronic resonant current. Our calculations have been compared with experimental results turning out to be in good agreement. Also the effect on the coherent tunneling of a magnetic field parallel to the current in the presence of light, has been considered. 73.40.G

Photon assisted long-range tunneling

“…Photon assisted transport in nanostructures has been object of intense research 2 . We mention only those references close to this work in double barriers [5][6][7][8][9] and quantum dots 4,[10][11][12][13][14][15][16][17][18][19][20][21] . An additional and important effect of photon assisted tunneling is the renormalization of the tunnel couplings which become dependent on the parameters of the driving.…”

Charge transport through open driven two-level systems with dissipation

“…In general, AC driven systems 41,42 and their application to various mesoscopic transport 43,44,45,46,47,48,49,50 and tunneling 51,52,53,54,55,56,57,58,59,60,61,62,63 regimes have quite a long history, although the inclusion of interactions and correlations is a relatively new area. In low-dimensional systems, investigations have concentrated on one-dimensional models 64,65,66,67,68 , the modification of Kondo-resonances by AC fields 69,70 , mean-field type approximations 71 , or exact studies of driven few-electron systems 72,73 .…”

Photon Assisted Tunneling in Quantum Dots

“…Since there is no electric field in the scattering-free leads, mixing of electron states [19], or photon absorption is absent in the leads. A positive or negative n corresponds to the absorption or emission, respectively, of n photons during the tunnel process.…”