Effective widths of boson gas confined in a harmonic rotating trap

In this Letter, we evaluate the radial and axial square radii (effective widths) of a rapidly rotating boson gas. The corresponding effective area and the expansion energy are calculated from these effective widths. A modified semiclassical approximation is suggested. This approach provides significant corrections to these quantities, such as finite size effect and indirectly interaction effect. We show that the effective widths still follow a non-rotating temperature dependence. Rotation leads to expansion or shrinking the effective widths through the change of the harmonic frequencies of the confinement trap. ► In the present Letter the effective widths for rotating boson gas in harmonic trap are investigated. ► The corresponding effective area and expansion energy are extracted. ► The main effects, such as finite size, and inter-atomic interaction, are considered simultaneously. ► The above mentioned parameters exhibit a characteristic rotation rate dependence.