The effect of trap anharmonicity on the critical temperature for Bose-Einstein condensation

TL;DR

This paper investigates how trap anharmonicity influences the critical temperature for Bose-Einstein condensation, revealing a significant increase in temperature in elongated magnetic traps, especially microtraps.

Contribution

It demonstrates that trap anharmonicity can notably raise the critical temperature for Bose-Einstein condensation in elongated magnetic traps.

Findings

Anharmonicity increases BEC critical temperature by up to 45%.

Effect is more significant in microtraps with millimeter dimensions.

Traditional traps are less affected by anharmonicity.

Abstract

The anharmonicity of a magnetic atomic trap at long distances from its center (forty times the radius of the first atomic orbit along the elongated axis, i.e. hundreds of microns) is shown to increase up to 45 % the temperature for Bose-Einstein condensation. This effect is perhaps small in the traditional traps, but should certainly be taken into account in magnetic microtraps, which characteristic dimensions are of order 1 mm.