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Fine structure of exciton complexes in high-symmetry quantum dots: Effects of symmetry breaking and symmetry elevation

机译:高对称量子点中激子复合物的精细结构:对称破坏和对称高度的影响

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摘要

Quantum dots (QDs) of high symmetry (e.g., C_(3v)) have degenerate bright exciton states, unlike QDs of C_(2v) symmetry, making them intrinsically suitable for the generation of entangled photon pairs. Deviations from C_(3v) symmetry are detected in real QDs by polarization-resolved photoluminescence spectroscopy in side-view geometry of InGaAs/AlGaAs dots formed in tetrahedral pyramids. The theoretical analysis reveals both an additional symmetry plane and weak symmetry breaking, as well as the interplay with electron-hole and hole-hole exchange interactions manifested by the excitonic fine structure.
机译:与C_(2v)对称的量子点不同,高对称性的量子点(QD)(例如C_(3v))具有退化的激子态,使其本质上适合于纠缠的光子对的产生。通过偏振分辨光致发光光谱法在四面体金字塔中形成的InGaAs / AlGaAs点的侧视图几何图中检测到与C_(3v)对称性的偏差。理论分析揭示了附加的对称平面和弱对称断裂,以及与激子精细结构所表现出的电子-空穴和空穴-空穴交换相互作用的相互作用。

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  • 来源
    《Physical review》 |2010年第16期|161307.1-161307.4|共4页
  • 作者单位

    Ecole Polytechnique Federate de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland Department of Physics, Chemistry, and Biology (IFM), Semiconductor Materials, Linkoe'ping University, S-58183 Linkoeping, Sweden;

    rnEcole Polytechnique Federate de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland;

    rnEcole Polytechnique Federate de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland;

    rnEcole Polytechnique Federate de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland;

    rnEcole Polytechnique Federate de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland;

    rnDepartment of Physics, Chemistry, and Biology (IFM), Semiconductor Materials, Linkoe'ping University, S-58183 Linkoeping, Sweden;

    rnEcole Polytechnique Federate de Lausanne (EPFL), Laboratory of Physics of Nanostructures, CH-1015 Lausanne, Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantum dots; exchange interactions; quantum dots; photoluminescence, properties and materials;

    机译:量子点;交流互动;量子点;光致发光;性质和材料;

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