Quantum Transport through a Quantum Well in the Presence of a Finite-Range Time-Modulated Potential

C. S. Chu ； H. C. Liang

《Chinese Journal of Physics》 37卷5期 (1999/10) Pp. 509-518

並列摘要

We have studied the transport of electrons through a quantum well within which a time-modulated potential of amplitude V2, range a, and frequency w is applied. Our results show that, as the chemical potential p increases, the dc conductance G exhibits Fano-structures when μ is at mhw above the bound state energy in the well. As V2 increases, the Fano-structures are broadened, and higher mhw 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.