Novel duality in disorder driven local quantum criticality.
Novel duality in disorder driven local quantum criticality.
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DOI：
10.1103/physrevlett.105.116403
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发表时间：
2010-05
影响因子：
8.6
通讯作者：
Minh-Tien Tran;Ki-Seok Kim
中科院分区：
文献类型：
--
作者：
Minh-Tien Tran;Ki-Seok Kim
我们发现随机近藤和随机磁相关之间的竞争导致了从局部费米液体到自旋液体的量子相变。结果表明，局部电荷磁化率与局部自旋磁化率具有完全相同的临界指数，这表明在朗道-金兹堡-威尔逊对称破缺框架之外，近藤单线态与临界局部矩态之间存在一种新的对偶性。这导致我们提出了局部量子临界点的增强对称性，由自旋和电荷的O(4)向量描述。在临界杂质动力学中，对称性增强是电子分馏化的一种机制，这种分馏化激发与拓扑激发相一致。
We find that competition between random Kondo and random magnetic correlations results in a quantum phase transition from a local Fermi liquid to a spin liquid. The local charge susceptibility turns out to have exactly the same critical exponent as the local spin susceptibility, suggesting a novel duality between the Kondo singlet phase and the critical local moment state beyond the Landau-Ginzburg-Wilson symmetry breaking framework. This leads us to propose an enhanced symmetry at the local quantum critical point, described by an O(4) vector for spin and charge. The symmetry enhancement serves as a mechanism of electron fractionalization in critical impurity dynamics, where such fractionalized excitations are identified with topological excitations.