Ground state pressure and energy density of an interacting homogeneous Bose gas in two dimensions
Institute for Theoretical Physics, University of Utrecht,
Leuvenlaan 4, 3584 CE Utrecht, The Netherlands
Corresponding author: a firstname.lastname@example.org
Published online: 13 August 2002
We consider an interacting homogeneous Bose gas at zero temperature in two spatial dimensions. The properties of the system can be calculated as an expansion in powers of g, where g is the coupling constant. We calculate the ground state pressure and the ground state energy density to second order in the quantum loop expansion. The renormalization group is used to sum up leading and subleading logarithms from all orders in perturbation theory. In the dilute limit, the renormalization group improved pressure and energy density are expansions in powers of the and , respectively, where is the two-body T-matrix.
PACS: 03.75.Fi – Phase coherent atomic ensembles; quantum condensation phenomena / 05.45.Ac – Low-dimensional chaos
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002