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arXiv 1002.3736cond-mat.mes-hall
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少电子横向InGaAs-InAlAs量子点的单重态-三重态跃迁

Singlet-triplet transition in a few-electron lateral InGaAs-InAlAs quantum dot

F. Deon, V. Pellegrini, F. Carillo, F. Giazotto, L. Sorba, G. Biasiol, F. Beltram

摘要:

报道了横向InGaAs/InAlAs量子点在少电子区的库仑阻塞峰的磁场演化。量子点由蒸镀到60 nm厚的氢倍半硅氧烷绝缘膜上的栅极限定。通过零偏自旋谱测量了旋磁因子为4.4,并在面内磁场B = 0.7 T时发现了从单重态到三重态自旋组态的转变。这一观测结果为在中等磁场下操纵单重态和三重态开辟了道路,并将讨论其与量子信息应用的相关性。

英文摘要:

The magnetic-field evolution of Coulomb blockade peaks in lateral InGaAs/InAlAs quantum dots in the few-electron regime is reported. Quantum dots are defined by gates evaporated onto a 60 nm-thick hydrogen silsesquioxane insulating film. A gyromagnetic factor of 4.4 is measured via zero-bias spin spectroscopy and a transition from singlet to triplet spin configuration is found at an in-plane magnetic field B = 0.7 T. This observation opens the way to the manipulation of singlet and triplet states at moderate fields and its relevance for quantum information applications will be discussed.

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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