Overscreened single-channel Kondo problem.
Overscreened single-channel Kondo problem.
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过度筛选单通道近藤问题。
DOI：
10.1103/physrevb.54.14918
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Kim
中科院分区：
文献类型：
--
作者：
Sengupta;Kim
我们考虑自旋为S的杂质与自旋为j的导电电子之间的近藤耦合的单通道近藤问题。这些问题出现在两个和更高级别的隧穿系统的参数空间中的多临界点，以及一些重费米子化合物的杂质模型。与以前的Bethe-anstaz理论相反，我们发现自旋扇形的动力学与自旋S杂质耦合到自旋1/2电子的k（j）$通道的动力学是相同的，其中k（j）= 2 j（j+1）（2 j +1）/3$.结果表明，当2S < k（j）时，系统表现为非费米液体行为，其热力学量的指数与k（j）通道Kondo问题的指数相同.然而，由于其他扇区的存在，有限尺寸谱和算子内容都是不同的，并且可以通过共形场论技术获得。
We consider the single channel Kondo problem with the Kondo coupling between a spin $S$ impurity and conduction electrons with spin $j$. These problems arise as multicritical points in the parameter spaces of two- and higher-level tunneling systems, and some impurity models of heavy fermion compounds. In contrast to the previous Bethe-anstaz conjectures, it turns out that the dynamics of the spin sector is the same as that of a spin $S$ impurity coupled to $k(j)$ channels of spin $1/2$ electrons with $k(j) = 2j(j+1)(2j+1)/3$. As a result, for $2S < k(j)$, the system shows non-Fermi liquid behavior with the same exponents for the thermodynamic quantities as those of $k(j)$ channel Kondo problem. However, both the finite-size spectrum and the operator content are different due to the presence of the other sectors and can be obtained by conformal field theory techniques.