Spectrum statistics in the integrable Lieb-Liniger model
| Autor: | Felix M. Izrailev, Fausto Borgonovi, Samy Mailoud |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Quantum Physics Nonlinear Sciences - Exactly Solvable and Integrable Systems Integrable system Statistical Mechanics (cond-mat.stat-mech) FOS: Physical sciences Weak interaction Poisson distribution random matrices Bethe ansatz Momentum symbols.namesake Statistics symbols Settore FIS/02 - FISICA TEORICA MODELLI E METODI MATEMATICI Lieb–Liniger model Exactly Solvable and Integrable Systems (nlin.SI) Quantum Physics (quant-ph) Quantum Condensed Matter - Statistical Mechanics quantum chaos Boson |
| DOI: | 10.48550/arxiv.2105.02967 |
| Popis: | We address the old and widely debated question of the statistical properties of integrable quantum systems, through the analysis of the paradigmatic Lieb-Liniger model. This quantum many-body model of 1-d interacting bosons allows for the rigorous determination of energy spectra via the Bethe ansatz approach and our interest is understanding whether Poisson statistics is a characteristic feature of this model. Using both analytical and numerical studies we show that the properties of spectra strongly depend on whether the analysis is done for a full energy spectrum or for a single subset with fixed total momentum. We show that the Poisson distribution of spacing between nearest-neighbor energies can occur only for a set of energy levels with fixed total momentum, for neither too large nor too weak interaction strength, and for sufficiently high energy. On the other hand, when studying long-range correlations between energy levels, we found strong deviations from the predictions given by a Poisson process. Comment: 12 pages, 7 figures |
| Databáze: | OpenAIRE |
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