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Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics

Stimulated Raman adiabatic passage for the photon‐assisted tunneling in a double quantum dot

Shinji Abe, Hirotaka Sasakura, S. Adachi, Shunichi Muto

Published Dec 1, 2006• 1 citation
Publisher

Abstract

We have investigated the pulse parameters of the stimulated Raman adiabatic passage (STIRAP) for efficient electron transfer in the coupled quantum dot system, and we found that STIRAP is sensitive to the difference between the dipole moments of the involved transitions. We have designed the QD structures where this drawback can be suppressed, to show the practicality of the photon-assisted tunneling between spatiallyseparated QDs. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

DOI
10.1002/pssc.200672839

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We have investigated the pulse parameters of the stimulated Raman adiabatic passage (STIRAP) for efficient electron transfer in the coupled quantum dot system, and we found that STIRAP is sensitive to the difference between the dipole moments of the involved transitions. We have designed the QD structures where this drawback can be suppressed, to show the practicality of the photon-assisted tunneling between spatiallyseparated QDs. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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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.
The rovibrational dynamics of stimulated Raman adiabatic passage (STIRAP) through permanent dipole moment transitions are investigated theoretically using a time-dependent quantum wave packet method for the ground electronic state of an HF molecule. The two basic STIRAP processes, $\ensuremath{\Lambda}$ and ladder systems, are simulated. The calculated results show that nearly 100100%100 of the population can be transferred to the target state. Besides the interested transitions, the pulses can induce other transitions which affect the dynamics of STIRAP. The final populations of the initial and target states depend on delay time.
Abstract We study the evolution of a quantum dot controlled by a frequency‐swept (chirped), linearly polarized laser pulse in the presence of carrier‐phonon coupling. The final occupation of the exciton state is limited both due to phonon‐induced transitions between the adiabatic spectral branches and because of phonon‐assisted transitions to the biexcitostate. When the biexciton shift is large enough, the quantum dot can be modeled as a two‐level system, which corresponds to excitation with circularly polarized light. For this case, we compare different methods of simulations: (i) a time convolutionless method, (ii) correlation expansion and (iii) path integrals. We show that results obtained from these methods agree perfectly at temperatur. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The population transfer of stimulated Raman adiabatic passage (STIRAP) is investigated using a time-dependent quantum wave packet method. The population is transferred from an initial state to a target state through the interaction of the external laser field with the permanent dipole moment and the transition dipole moment. The laser field is composed of an infrared pulse and a near ultraviolet pulse. The two pulses with small detunings are more efficient to achieve the STIRAP transition. The process of STIRAP is sensitive to the detunings of the two pulses. When the two detunings are the same in a Λ transition or the positive detuning of the pump pulse is equal to the negative detuning of the Stokes pulse in a ladder transition, the final population in the intermediate state can be eliminated and the target population is increased.
The rovibrational dynamics of an extended ladder stimulated Raman adiabatic passage (STIRAP) system through permanent dipole moment transitions is investigated theoretically using the time-dependent quantum-wave-packet method for the ground electronic state of the HF molecule. The calculated results show that nearly 100% of the population can be transferred to the target state through (1+2), (1+3), and (2+2) STIRAP schemes. By choosing a suitable excitation pathway, the effects of the background states on the final population of the target state can be removed. For the multiphoton STIRAP process, the one-photon overtone pump scheme is more efficient than the two-photon pump scheme in controlling the population transfer to the target state.