Conductance via the multiorbital Kondo effect in single quantum dots

Conductance via the multiorbital Kondo effect in single quantum dots
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通过单量子点中的多轨道近藤效应实现电导

DOI:
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发表时间:
2006
期刊:
影响因子:
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通讯作者:
N. Kawakami
N. Kawakami
中科院分区:
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文献类型:
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作者:
R. Sakano;N. Kawakami

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利用零温度下的Bethe-Anklund精确解和有限温度下的非交叉近似,研究了具有两个或三个轨道的单量子点系统中的Kondo效应.对于双轨道近藤效应,电导在任何磁场中在绝对零度下都是常数,但在有限温度下随着磁场的增加而单调减小。在具有更多轨道的情况下,电导在绝对零度处增加,而它在有限温度下具有作为磁场的函数的最大结构。我们讨论了这些特征输运性质是如何来自磁场中的多轨道近藤效应。
We study the Kondo effect in a single quantum dot system with two or three orbitals by using the Bethe-ansatz exact solution at zero temperature and the non-crossing approximation at finite temperatures. For the two-orbital Kondo effect, the conductance is shown to be constant at absolute zero in any magnetic fields, but decrease monotonically with increasing fields at finite temperatures. In the case with more orbitals, the conductance increases at absolute zero, while it features a maximum structure as a function of the magnetic field at finite temperatures. We discuss how these characteristic transport properties come from the multi orbital Kondo effect in magnetic fields.