Quantum transport through a quantum well in the presence of a finite-range time-modulated potential

Abstract

We have studied the transport of electrons through a quantum well within which a time-modulated potential of amplitude V-2, range a, and frequency w is applied. Our results show that, as the chemical potential mu increases, the de conductance G exhibits Fano-structures when mu is at m (h) over bar w above the bound state energy in the well. As V-2 increases, the Fano-structures are broadened, and higher m (h) over bar w processes emerge. These features are identified as the formation of quasi-bound states. For a fixed but large potential strength V-1 = aV(2), the Fano-structures are broadened and are shifted toward lower electron energies, as a decreases. The dependence of the Fano-structure to the location of the time-modulated potential is also studied.