Simulation studies of photon-assisted quantum transport
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概要
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Direct numerical simulations were performed to investigate conditions for the strong effects of photonassistedquantum transport. Transmission probabilities of incident electrons as Gaussian wave packets werecalculated for single- and double-barrier structures irradiated by electromagnetic fields that were focusedwithin a finite region ξ ac . When the period of the ac electromagnetic field is short compared with the timet ξ ac, which is the traversal time of the electrons in the region of the applied ac field, the transmission probabilitycan be affected by photon emission and photon absorption. The magnitude of these effects stronglydepends on the width ξ ac and the bound-state character of the electrons. These dependences can be understoodfrom the selection rule, which results from the momentum conservation of the electron and photon system.Consequently, we have shown that photon-assisted transport over a single barrier is difficult to achieve intwo-dimensional electron-gas devices due to the relatively long screening length. We have demonstrated,however, that the photon-assisted process is significantly enhanced in double-barrier devices due toquasibound-to-extended-state transitions.
- American Physical Societyの論文
- 1996-09-15
American Physical Society | 論文
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