Tuning the scattering length on the ground triplet state of Cs_2

Abstract

We develop two schemes for tuning the scattering length on the ground triplet state of Cs_2. First, an absolute value of the triplet scattering length of ^{133}Cs_2 is determined using the experimental data (Fioretti et al, Eur.Phys.J. 5, 389 (1999)). We demonstrate that the large scattering length can be made small and positive by coupling of the ^3Σ_u^+ (6S + 6S) potential to the ^3Π_g state by strong off-resonant radiation. A weaker laser field coupling the ^3Σ_u^+ (6S + 6S) continuum to the lowest bound level of the excited ^3Σ_g^+ (6S + 6P) also leads to a small positive scattering length. In addition, the scattering length of the ^{135}Cs isotope is found to be positive. The method used solves the Schroedinger equation for two electronic states coupled by an electromagnetic field with approximations employed. The scattering length is determined from calculated continuum wavefunctions of low energy.

4 figures, a discussion of influence of the C_6 coeficient on the scattering length of different isotopes is added

References in corpus (4)

• Influence of nearly resonant light on the scattering length in low-temperature atomic gases
• High-precision calculations of dispersion coefficients, static dipole polarizabilities, and atom-wall interaction constants for alkali-metal atoms
• Controlling atom-atom interaction at ultralow temperatures by dc electric fields
• Evolution and global collapse of trapped Bose condensates under variations of the scattering length

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