Bose-Einstein condensation of non-ground state caesium atoms

We report the Bose-Einstein condensation of caesium atoms in the Zeeman-excited mf = 2 state. As the magnetic field is varied, we identify two regions in which the dipolar relaxation rate is sufficiently suppressed so that condensation becomes possible. We characterize the phase transition and quantify the loss processes, finding unusually high three-body losses in one of the two regions. Our experimental results otherwise agree well with the theoretical expectation. In particular, we confirm the presence of a narrow Feshbach resonance near a zero crossing in the background scattering length. Our results open up new possibilities for the mixing of quantum-degenerate gases and the study of impurity transport in strongly correlated one-dimensional quantum wires.