期刊
ANNALS OF PHYSICS
卷 356, 期 -, 页码 467-497出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.aop.2015.03.007
关键词
Unitary Fermi gas; Operator product expansion; Sum rules; Maximum entropy method
资金
- RIKEN Foreign Postdoctoral Researcher Program
- RIKEN iTHES Project
- JSPS [20192700, 25887020, 26887032, 30130876]
- Grants-in-Aid for Scientific Research [26887032, 25887020, 25287066] Funding Source: KAKEN
Making use of the operator product expansion, we derive a general class of sum rules for the imaginary part of the single-particle self-energy of the unitary Fermi gas. The sum rules are analyzed numerically with the help of the maximum entropy method, which allows us to extract the single-particle spectral density as a function of both energy and momentum. These spectral densities contain basic information on the properties of the unitary Fermi gas, such as the dispersion relation and the superfluid pairing gap, for which we obtain reasonable agreement with the available results based on quantum Monte-Carlo simulations. (C) 2015 Elsevier Inc. All rights reserved.
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