Nonadiabatic Electron Manipulation in Quantum-Dot Arrays

Details Nonadiabatic Electron Manipulation in Quantum-Dot Arrays Nonadiabatic Electron Manipulation in Quantum-Dot Arrays

2004-11-18

arxiv.org/abs/cond-mat/0411468v1

PRB 70, 201304(R) (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.70.201304

A novel method of coherent manipulation of the electron tunneling in quantum-dots is proposed, which utilizes the quantum interference in nonadiabatic double-crossing of the discrete energy levels. In this method, we need only a smoothly varying gate voltage to manipulate electrons, without a sudden switching-on and off. A systematic design of a smooth gate-pulse is presented with a simple analytic formula to drive the two-level electronic state to essentially arbitrary target state, and numerical simulations for complete transfer of an electron is shown for a coupled double quantum-dots and an array of quantum-dots. Estimation of the manipulation-time shows that the present method can be employed in realistic quantum-dots.

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