Numerical Study of Electron Transport in Coherently Driven Double-Barrier Systems : Condensed Matter: Electronic Properties, etc.

概要

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Quantum transport in harmonically driven double-barrier systems has been studied quantitatively by using a transfer matrix method, especially focusing our attention on the conductance as a function of the strength of the time-varying potential. In the case that the frequency ω of the time-varying potential is different from Δε/h^^- (Δε is the energy distance between adjacent resonant levels of the system), it is found that the sideband quenching predicted previously does not occur perfectly if static and time-varying potentials have continuous profiles as in a realistic system. Although previous theories have suggested that the spectral weight of sideband components is scaled by ω^<-2> for inhomogeneous time-varying potentials, our results show that conductance dips corresponding to the quenching scale with ω^<-1>. In the case that h^^-ω = Δε, the Rabi-type splitting is observed. We clarified that the profile of the time-varying potential affects significantly how the resonant level splits. Furthermore, the quenching effect on the Rabi-type splitting is also discussed.
社団法人日本物理学会の論文
2000-11-15