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Thermodynamics of Bose-Einstein gas trapped in D-dimensional quartic potentials

2010-04-01
Karabulut, Elife Oe
Koyuncu, Mustafa
Tomak, Mehmet
Quartic potentials play air important role in a broad range of fields in the Bose-Einstein Condensation (BEC) literature, from optical lattices to vortices and even to the quantum phase transitions. This also makes the study of thermodynamic properties of systems confined by these potentials interesting. For this purpose, the BEC of an ideal Bose system with a finite number of particles is considered in three and lower dimensions. A comprehensive thermodynamic analysis including the condensation temperature, chemical potential, condensate fraction, hear capacity, total energy, and entropy has been carried Out with a special emphasis oil low-dimensional case for which the standard semi-classical method is not applicable. As a result of our Calculations based Oil a quantum mechanical treatment we have shown that BEC is possible in a one-dimensional quartic potential, in contrast with the predictions of the standard method. Moreover it is also possible to corroborate Our results by using a modified semi-classical approximation that enables LIS to estimate the condensation temperatures for one-dimensional traps for all powers of the confining potential. We have found higher condensation temperatures than for the harmonic traps for all the three spatial configurations of the quartic trap. (C) 2009 Elsevier B.V. All rights reserved.