Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-05-24
Phys. Rev. Lett. 105, 116403 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
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 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 mechanism of electron fractionalization in critical impurity dynamics, where such fractionalized excitations are identified with topological excitations.
Kim Ki-Seok
Tran Minh-Tien
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