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arXiv 1002.3114cond-mat.mes-hallcond-mat.str-el
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光学可调量子点中的关联电子:构建电子二聚体分子

Correlated electrons in optically-tunable quantum dots: Building an electron dimer molecule

Achintya Singha, Vittorio Pellegrini, Aron Pinczuk, Loren N. Pfeiffer, Ken W. West, Massimo Rontani

摘要:

我们观察到GaAs半导体量子点中由两个电子形成的分子二聚体的低激发态,量子点中受限电子的数目可以通过光照射来调节。通过采用非弹性光散射,我们确定了壳层间激发在一个电子制度和不同的自旋和电荷模式的相互作用少体配置。在两个电子的情况下,与组态相互作用计算的比较,使我们能够链接所观察到的激发与呼吸模式的分子二聚体,并确定单重态-三重态能量分裂。

英文摘要:

We observe the low-lying excitations of a molecular dimer formed by two electrons in a GaAs semiconductor quantum dot in which the number of confined electrons is tuned by optical illumination. By employing inelastic light scattering we identify the inter-shell excitations in the one-electron regime and the distinct spin and charge modes in the interacting few-body configuration. In the case of two electrons a comparison with configuration-interaction calculations allows us to link the observed excitations with the breathing mode of the molecular dimer and to determine the singlet-triplet energy splitting.

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