Precision measurement of spin-dependent interaction strengths for spin-1 and spin-2 87Rb atoms

摘要: We report on precision measurements of spin-dependent interaction-strengths in the 87Rb spin-1 and spin-2 hyperfine ground states. Our method is based recent observation coherence collisionally driven spin-dynamics ultracold atom pairs trapped optical lattices. Analysis Rabi-type oscillations between two spin states an pair allows a direct determination coupling parameters interaction Hamiltonian. deduce differences scattering lengths from our data that can directly be compared to theoretical predictions order test interatomic potentials. agree with within 20%. The knowledge these one determine nature magnetic state. imply ferromagnetic state for f = 1 manifold, agreement earlier experiments performed without lattice. For 2 point towards antiferromagnetic state; however error bars do not exclude possible cyclic phase.