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Semiconductors

Selective electron transfer between quantum dots induced by a resonance pulse

L. А. Openov, A. V. Tsukanov

Published Feb 1, 2005• 6 citations
Publisher

Abstract

A theoretical study of the effect of a resonance electromagnetic pulse on the coherent electron dynamics in a system of tunneling-coupled quantum dots (QDs) arranged in a closed-ring configuration is carried out. It is shown that selective electron transfer between two arbitrary QDs is possible. The transfer probability is calculated as a function of the parameters that characterize the QDs and the electromagnetic pulse. It is shown that this probability can be close to unity. Factors leading to a reduction of the transfer probability in a realistic system are considered. The results obtained can be used for the development of new types of nanoelectronic devices for performing operations with quantum bits.

DOI
10.1134/1.1864206

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A theoretical study of the effect of a resonance electromagnetic pulse on the coherent electron dynamics in a system of tunneling-coupled quantum dots (QDs) arranged in a closed-ring configuration is carried out. It is shown that selective electron transfer between two arbitrary QDs is possible. The transfer probability is calculated as a function of the parameters that characterize the QDs and the electromagnetic pulse. It is shown that this probability can be close to unity. Factors leading to a reduction of the transfer probability in a realistic system are considered. The results obtained can be used for the development of new types of nanoelectronic devices for performing operations with quantum bits.
The coherent quantum dynamics of an electron in the quantum-dot ring structure under the resonant electromagnetic pulse is studied theoretically. A possibility of the selective electron transfer between any two dots is demonstrated. The transfer probability as a function of the pulse and dot parameters is calculated. It is shown that this probability can be close to unity. The factors lowering the transfer probability in real systems are discussed. The results obtained may be used in the engineering of novel nanoelectronic devices for quantum bits processing. 1
The coherent quantum dynamics of an electron in the quantum-dot ring structure under the resonant electromagnetic pulse is studied theoretically. A possibility of the selective electron transfer between any two dots is demonstrated. The transfer probability as a function of the pulse and dot parameters is calculated. It is shown that this probability can be close to unity. The factors lowering the transfer probability in the real system are discussed. The results obtained may be used in the engineering of novel nanoelectronic devices for quantum bits processing.
We theoretically investigate the coherent transfer of one electron between the ground states of a double coupled quantum dot structure. The coherent transfer of the electron is externally controlled by applied electromagnetic fields with on- or close-resonance driving frequencies and various shapes and duration. We derive the analytical expressions for the parameters of the external fields by approximating the quantum dot system as a three-level Λ-type system. The analytical solutions are compared with numerical results and good agreement is found. The control methods developed here are applicable in symmetric and asymmetric quantum dot nanostructures.
A new type of nutation oscillations occurring only in the phase of an electromagnetic wave propagating in an ensemble of quantum dots is described. The interaction of the electromagnetic wave with quantum dots produces the transitions of electron between states of approximately equal energies without any changes in the intensity of the wave. The period of nutation oscillations is shown to be defined by the main parameters describing the electromagnetically induced electron transfer. Nutation effect is considered for the case of nonresonant electromagnetic pulse with a rectangular form of its amplitude.
We study the potential for coherent transfer of a single electron between the ground states of two anharmonic coupled quantum dots using an adiabatic passage method. We consider the interaction of a quantum dot structure characterized by an asymmetric confining potential by two external electromagnetic fields. We use the method of stimulated Raman adiabatic passage (STIRAP) for control of the dynamics of the electron, and ultimately for succeeding the transfer of the electron from the initially occupied quantum dot to the other quantum dot. Results for several values of the parameters of the applied electromagnetic fields are presented, and we show that STIRAP can lead to efficient coherent single electron transfer for a wide range of these parameters.
We study infrared-light propagation and dynamical control of a tunable three-level system in a driven quantum-dot (QD) molecule by means of interdot tunnelling instead of a pumping laser. By numerically solving coupled Bloch?Maxwell equations, it is shown that under the resonant tunnelling condition, an interband (IB) infrared-light pulse acting as a 'signal' can propagate with transparency due to the strong tunnelling-induced coupling. However, when the applied bias voltage tilts the energy levels of the structure such that the levels of the different dots move out of resonance (i.e., the nonresonant tunnelling), with an increase of detuning ?12, the coupling efficiency of interdot tunnelling decreases considerably and the IB infrared-light pulse will be almost completely absorbed after a characteristic propagation length. This can work as an absorptive optical switch where a signal (IB infrared light) is fully controlled by the external bias voltage. Our calculations provide a guideline for the development of new types of nanoelectronic devices in the QD solid-state system, which is much more practical than that in an atomic system because of its flexible design and the controllable (tunable) interference strength.