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Criticality of the low-frequency conductivity for the bilayer quantum Heisenberg model

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Abstract

The criticality of the low-frequency conductivity for the bilayer quantum Heisenberg model was investigated numerically. The dynamical conductivity (associated with the O(3) symmetry) displays the inductor σ(ω) = (iωL)−1 and capacitor iωC behaviors for the ordered and disordered phases, respectively. Both constants, C and L, have the same scaling dimension as that of the reciprocal paramagnetic gap Δ−1. Then, there arose a question to fix the set of critical amplitude ratios among them. So far, the O(2) case has been investigated in the context of the boson-vortex duality. In this paper, we employ the exact diagonalization method, which enables us to calculate the paramagnetic gap Δ directly. Thereby, the set of critical amplitude ratios as to C, L and Δ are estimated with the finite-size-scaling analysis for the cluster with N ≤ 34 spins.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Okayama University, Okayama, 700-8530, Japan

    Yoshihiro Nishiyama

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  1. Yoshihiro Nishiyama
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Correspondence to Yoshihiro Nishiyama.

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Nishiyama, Y. Criticality of the low-frequency conductivity for the bilayer quantum Heisenberg model. Eur. Phys. J. B 91, 69 (2018). https://doi.org/10.1140/epjb/e2018-80707-7

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  • DOI: https://doi.org/10.1140/epjb/e2018-80707-7

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