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Fidelity and criticality of quantum Ising chain with long-range interactions

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arxiv 1805.04408 v1 pith:VFFNNFKS submitted 2018-05-11 cond-mat.quant-gas

classification cond-mat.quant-gas
keywords fidelityisingalphachainlong-rangequantumsusceptibilityclass
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abstract

We study the criticality of long-range quantum ferromagnetic Ising chain with algebraically decaying interactions $1/r^{\alpha}$ via the fidelity susceptibility based on the exact diagonalization and the density matrix renormalization group techniques. We find that critical exponents change monotonously from the mean-field universality class to the short-range Ising universality class for intermediate $\alpha$, which are consistent with recent results obtained from renormalization group. In addition, we determine the critical values for $1.8 \le \alpha \le 3$ from the finite-size scaling of the fidelity susceptibility. Our work provides very nice numerical data from the fidelity susceptibility for the quantum long-range ferromagnetic Ising chain.

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  1. Perturbative Renormalization and Universality Diagram for Long-Range Quantum Criticality

    cond-mat.stat-mech 2026-06 unverdicted novelty 7.0 of 10

    A controlled ε-δ expansion around the LR-SR boundary yields two-loop expressions for ν, η_ω and η_k in long-range quantum O(n) models together with a proposed universality diagram.

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