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arXiv 1102.2977cond-mat.mes-hallcond-mat.str-el
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单原子晶体管中SU(4)近藤共振的磁场探测

Magnetic Field Probing of an SU(4) Kondo Resonance in a Single Atom Transistor

G. C. Tettamanzi, J. Verduijn, G. P. Lansbergen, M. Blaauboer, M. J. Calderón, R. Aguado, S. Rogge

摘要:

半导体纳米器件已经被缩放到可以由单个掺杂剂原子支配传输的水平。在强耦合情况下,当一个电子与原子结合时,观察到近藤效应。在这里,我们报告的自旋以及轨道近藤基态。我们的实验以及理论上表明,我们如何可以调整从SU(4)基态的对称性过渡,形成自旋以及通过虚拟交换与铅的轨道单线态,一个纯SU(2)轨道基态,作为磁场的函数。掺杂剂基态的小尺寸和类s轨道对称性使其成为一个模型系统,其中磁场仅耦合到自旋自由度,并允许观察这种SU(4)到SU(2)跃迁。

英文摘要:

Semiconductor nano-devices have been scaled to the level that transport can be dominated by a single dopant atom. In the strong coupling case a Kondo effect is observed when one electron is bound to the atom. Here, we report on the spin as well as orbital Kondo ground state. We experimentally as well than theoretically show how we can tune a symmetry transition from a SU(4) ground state, a many body state that forms a spin as well as orbital singlet by virtual exchange with the leads, to a pure SU(2) orbital ground state, as a function of magnetic field. The small size and the s-like orbital symmetry of the ground state of the dopant, make it a model system in which the magnetic field only couples to the spin degree of freedom and allows for observation of this SU(4) to SU(2) transition.

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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