Non-Fermi-liquid fixed point
Non-Fermi-liquid fixed point
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非费米液体定点
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
D. L. Cox
中科院分区：
文献类型：
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作者：
Tae;Tae;L. N. Oliveira;D. L. Cox;D. L. Cox
研究了赝自旋为Sc = 3/2的传导电子与自旋为SI = 1/2的杂质电子的交换相互作用。由于高导电子自旋对杂质自旋的过屏蔽，实现了一个新的非平凡的中间耦合强度不动点。使用数值重整化群（NRG），我们表明，低能量谱描述的非费米液体激发谱。一个共形场理论分析与NRG的结果进行了比较，并获得了良好的协议。利用双熔合规则和保角理论生成算符谱，发现比热系数和磁化率将发散为T2/3，外加磁场的标度维数为5/6，交换各向异性总是相关的。我们讨论了可能的相关性，我们的工作，以二能级系统近藤材料和稀铈合金，我们指出了一个悖论，在理解的Bethe-Anglesia解决方案的多通道近藤模型。� 现住址。
We study a new exchange interaction in which the conduction electrons with pseudo spin Sc = 3/2 interact with the impurity spin SI = 1/2. Due to the overscreening of the impurity spin by higher conduction electron spin, a new non-trivial intermediate coupling strength fixed point is realized. Using the numerical renormalization group (NRG), we show that the low-energy spectra are described by a non-Fermi liquid excitation spectrum. A conformal field theory analysis is compared with NRG results and excellent agreement is obtained. Using the double fusion rule to generate the operator spectrum with the conformal theory, we find that the specific heat coefficient and magnetic susceptibility will diverge as T 2/3 , that the scaling dimension of an applied magnetic field is 5/6, and that exchange anisotropy is always relevant. We discuss the possible relevance of our work to two-level system Kondo materials and dilute cerium alloys, and we point out a paradox in understanding the Bethe-Ansatz solutions to the multichannel Kondo model. � Present address.