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- W3118306798 abstract "A multichannel Kondo model, where two or more equivalent but independent channels of electrons compete to screen a spin-1/2 impurity, shows overcompensation of the impurity spin, leading to the non-Fermi-liquid behavior in various thermodynamic and transport properties. However, when the channel symmetry is broken, an impurity quantum phase transition can occur at zero temperature. Identification of an order parameter describing the impurity quantum phase transition is very difficult since it is beyond the conventional Landau-Ginzburg-Wilson theory. By employing the natural orbitals renormalization group method, we study both two-channel and threechannel Kondo models, from the perspective of spin correlation between the impurity and electrons in electronic channels. Here we demonstrate that by introducing the spin-correlation ratio as an order parameter we can characterize impurity quantum phase transitions driven by channel asymmetry. In particular, the universal critical exponents $beta$ of the spin-correlation ratio and $nu$ of the correlation length are explicitly determined by finite-sizescaling analysis, namely, $beta = 0.10(1), nu = 2.0(1)$, and $beta = 0.10(1), nu = 2.5(1)$ for the two-channel and three-channel Kondo models, respectively." @default.
- W3118306798 created "2021-01-18" @default.
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- W3118306798 date "2021-01-11" @default.
- W3118306798 modified "2023-10-05" @default.
- W3118306798 title "Order parameter for the multichannel Kondo model at quantum criticality" @default.
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- W3118306798 doi "https://doi.org/10.1103/physrevb.103.045111" @default.
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