Optimal free descriptions of many-body theories

Christopher J. Turner (), Konstantinos Meichanetzidis (), Zlatko Papić and Jiannis K. Pachos
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Christopher J. Turner: School of Physics and Astronomy, University of Leeds
Konstantinos Meichanetzidis: School of Physics and Astronomy, University of Leeds
Zlatko Papić: School of Physics and Astronomy, University of Leeds
Jiannis K. Pachos: School of Physics and Astronomy, University of Leeds

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract Interacting bosons or fermions give rise to some of the most fascinating phases of matter, including high-temperature superconductivity, the fractional quantum Hall effect, quantum spin liquids and Mott insulators. Although these systems are promising for technological applications, they also present conceptual challenges, as they require approaches beyond mean-field and perturbation theory. Here we develop a general framework for identifying the free theory that is closest to a given interacting model in terms of their ground-state correlations. Moreover, we quantify the distance between them using the entanglement spectrum. When this interaction distance is small, the optimal free theory provides an effective description of the low-energy physics of the interacting model. Our construction of the optimal free model is non-perturbative in nature; thus, it offers a theoretical framework for investigating strongly correlated systems.

Date: 2017
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14926

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DOI: 10.1038/ncomms14926

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