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Transient properties of voltage-controlled transparency in an asymmetric double quantum dot

Marina Ioannou, John Boviatsis, Emmanuel Paspalakis

Physica E Low-dimensional Systems and NanostructuresSep 22, 200717 citations

Intense laser effects on the optical properties of asymmetric GaAs double quantum dots under applied electric field

Doina Bejan, Ecaterina Cornelia Niculescu

The European Physical Journal BMay 30, 201623 citations

Voltage Control Enhancement of Kerr Nonlinearity in Asymmetric Double Quantum Dots System

郭洪菊 Guo Hongju, 王春芳 Wang Chunfang

Laser & Optoelectronics ProgressJan 1, 20120 citations

Manipulative Properties of Asymmetric Double Quantum Dots via Laser and Gate Voltage

Zhao Shun-Cai, Zhengdong Liu

We present a density matrix approach for the theoretical description of an asymmetric double quantum dot (QD) system. The results show that the properties of gain, absorption and dispersion of the double QD system, the population of the state with one hole in one dot and an electron in another dot transferred by tunneling can be manipulated by a laser pulse or gate voltage. Our scheme may demonstrate the possibility of electro-optical manipulation of quantum systems.

arXiv:2403.12103Chinese Physics LettersJul 1, 200910 citations

Tunnel-optical electron transitions in an asymmetric double quantum dot under correction field

Alexander V. Tsukanov, I. Yu. Kateev

Abstract Quantum operations on a charge qubit, which is represented by a single-electron double quantum dot (QD) with structure asymmetry, are considered. It is shown that with the help of an electric field created by voltage gates the tunnel coupling of the QD excited states is possible to control. An algorithm for performing single-qubit rotations based on a sequence of tunnel and optical transitions is described. The dependences of the correction electric field on geometric parameters of the gates are calculated.Abstract Quantum operations on a charge qubit, which is represented by a single-electron double quantum dot (QD) with structure asymmetry, are considered. It is shown that with the help of an electric field created by voltage gates the tunnel coupling of the QD excited states is possible to control. An algorithm for performing single-qubit rotations based on a sequence of tunnel and optical transitions is described. The dependences of the correction electric field on geometric parameters of the gates are calculated.

Laser Physics LettersJun 27, 20251 citation

Plasmonic electromagnetic-induced transparency from double quantum dot–metal nanoparticle structure

Asaad H. Hameed, Amin Habbeb AL-Khursan

This work studies the energy absorption rates in the case of plasmonic electromagnetically induced transparency (PEIT) from the double quantum dot (DQD)–metal nanoparticle (MNP) system. The orthogonalized plane wave between the wetting layer (WL) and QD transitions is considered. PEIT is not attained under a single applied field. It is obtained under a probe, pump, and two tunneling components. Two asymmetric PEIT windows can result from the transitions between the sixth energy states of the DQD structure. A huge Qtotal value (10−5 W) under 0.2 W/cm2 is obtained. Compared with other works, this result is higher by four orders, and the power applied is less by six orders than that used in earlier works. Our results exceed those obtained with double MNP-QD, QD-six MNP, and MNP-ten QDs. Such a vast result is ascribed to the manipulation flexibility in the DQD system, which is not found in all other structures. This possibility increases quantum correlation and the nonlinear optical properties of the DQD and the DQD–MNP system. The QD ( QQD) and MNP ( QMNP) absorption energy rates are also studied. Applying two tunneling components restores the system to peak at resonance due to the coupled work of the two dots as a DQD system. Strong plasmon–exciton coupling occurs when the probe power becomes considerable. Thus, the probe must not be so small.This work studies the energy absorption rates in the case of plasmonic electromagnetically induced transparency (PEIT) from the double quantum dot (DQD)–metal nanoparticle (MNP) system. The orthogonalized plane wave between the wetting layer (WL) and QD transitions is considered. PEIT is not attained under a single applied field. It is obtained under a probe, pump, and two tunneling components. Two asymmetric PEIT windows can result from the transitions between the sixth energy states of the DQD structure. A huge Qtotal value (10−5 W) under 0.2 W/cm2 is obtained. Compared with other works, this result is higher by four orders, and the power applied is less by six orders than that used in earlier works. Our results exceed those obtained with double MNP-QD, QD-six MNP, and MNP-ten QDs. Such a vast result is ascribed to the manipulation flexibility in the DQD system, which is not found in all other structures. This possibility increases quantum correlation and the nonlinear optical properties of the DQD and the DQD–MNP system. The QD ( QQD) and MNP ( QMNP) absorption energy rates are also studied. Applying two tunneling components restores the system to peak at resonance due to the coupled work of the two dots as a DQD system. Strong plasmon–exciton coupling occurs when the probe power becomes considerable. Thus, the probe must not be so small.

Canadian Journal of PhysicsJun 13, 20251 citation

Manipulative Properties of Asymmetric Double Quantum Dots via Laser and Gate Voltage

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Manipulative Properties of Asymmetric Double Quantum Dots via Laser and Gate Voltage

Abstract

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