Nonperturbative Effects on T_c of Interacting Bose Gases in Power-Law Traps

Details Nonperturbative Effects on T_c of Interacting Bose Gases in Power-Law Traps Nonperturbative Effects on T_c of Interacting Bose Gases in Power-Law Traps

2004-11-05

arxiv.org/abs/cond-mat/0411133v2

Phys. Rev. A 71, 043614 (2005)

Physics

Condensed Matter

Statistical Mechanics

Author Information under http://www.physik.fu-berlin.de/~kleinert/institution.html . Latest update of paper (including all P

Scientific paper

10.1103/PhysRevA.71.043614

The critical temperature T_c of an interacting Bose gas trapped in a general power-law potential V(x)=\sum_i U_i|x_i|^{p_i} is calculated with the help of variational perturbation theory. It is shown that the interaction-induced shift in T_c fulfills the relation (T_c-T_c^0)/T_c^0= D_1(eta)a + D'(eta)a^{2 eta}+ O(a^2) with T_c^0 the critical temperature of the trapped ideal gas, a the s-wave scattering length divided by the thermal wavelength at T_c, and eta=1/2+\sum_i 1/p_i the potential-shape parameter. The terms D_1(eta)a and D'(eta) a^{2 eta} describe the leading-order perturbative and nonperturbative contributions to the critical temperature, respectively. This result quantitatively shows how an increasingly inhomogeneous potential suppresses the influence of critical fluctuations. The appearance of the a^{2 eta} contribution is qualitatively explained in terms of the Ginzburg criterion.

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