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arXiv 0908.3104cond-mat.mes-hallcond-mat.mtrl-sci
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单、双量子点中两电子态的精细结构

Fine structure of two-electron states in single and double quantum dots

M. M. Glazov

摘要:

从理论上研究了三重态两电子态的能谱精细结构。本文导出了锌晶格半导体纳米结构量子阱和量子点中电子-电子相互作用有效哈密顿量中的自旋-轨道相互作用诱导项。体和结构反转不对称的影响被考虑在内。导出了描述单量子点和横向双量子点中局域双电子态分裂的简单解析表达式。三重态的自旋简并度被自旋轨道相互作用完全提升。讨论了电子-电子相互作用中导带自旋分裂和自旋轨道项的相互作用。计算了热激子和双电荷激子的光致发光谱,揭示了双电子态的精细结构。

英文摘要:

Energy spectrum fine structure of triplet two-electron states is investigated theoretically. Spin-orbit interaction induced terms in the effective Hamiltonian of electron-electron interaction are derived for zinc-blende lattice semiconductor nanostructures: quantum wells and quantum dots. The effects of bulk and structural inversion asymmetry are taken into account. Simple analytical expressions describing the splittings of the two-electron states localized in a single quantum dot and in a lateral double quantum dot are derived. The spin degeneracy of triplet states is shown to be completely lifted by the spin-orbit interaction. An interplay of the conduction band spin splitting and the spin-orbit terms in electron-electron interaction is discussed. The photoluminescence spectra of hot trions and of doubly charged excitons are calculated and are shown to reveal the fine structure of two-electron states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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