We have studied the transport of electrons through a quantum well within which a time-modulated potential of amplitude V2, range a, and frequency ω is applied. Our results show that, as the chemical potential μ increases, the dc conductance G exhibits Fano-structures when μ is at mℏω above the bound state energy in the well. As V2 increases, the Fano-structures are broadened, and higher mℏω processes emerge. These features are identified as the formation of quasi-bound states. For a fixed but large potential strength V1 = aV2, 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.
|Number of pages||10|
|Journal||Chinese Journal of Physics|
|State||Published - 1 Dec 1999|