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The quantum Ising model: finite sums and hyperbolic functions
We derive exact closed-form expressions for several sums leading to hyperbolic functions and discuss their applicability for studies of finite-size Ising spin chains. We show how they immediately lead to closed-form expressions for both fidelity susceptibility characterizing the quantum critical poi...
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| Formato: | Online Artículo Texto |
| Lenguaje: | English |
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Nature Publishing Group
2015
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| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4626794/ https://www.ncbi.nlm.nih.gov/pubmed/26514674 http://dx.doi.org/10.1038/srep15779 |