期刊
EUROPEAN PHYSICAL JOURNAL D
卷 72, 期 3, 页码 -出版社
SPRINGER
DOI: 10.1140/epjd/e2018-80713-y
关键词
-
资金
- U.S. Department of Energy [DE-SC001347]
Nonuniversal effects due to leading effective-range corrections are computed for the ground-state energy of the weakly-coupled repulsive Bose gas in two spatial dimensions. Using an effective field theory of contact interactions, these corrections are computed first by considering fluctuations around the mean-field free energy of a system of interacting bosons. This result is then confirmed by an exact calculation in which the energy of a finite number of bosons interacting in a square with periodic boundary conditions is computed and the thermodynamic limit is explicitly taken.
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