Atom chip-based ultracold potassium for testing microwave and RF potentials

We present progress on an experiment to manipulate and trap ultracold atoms with microwave and RF ($\mu $/RF) AC Zeeman potentials produced with an atom chip. These $\mu $/RF potentials are well suited for atom interferometry and 1D many-body physics studies due to their inherent spin-dependent nature and ability to operate in conjunction with magnetic Feshbach resonances to tune interactions. We have completed a dual species, dual chamber apparatus for producing ultracold rubidium and potassium gases on an rf-capable atom chip. The system produces Bose-Einstein condensates of 10$^{\mathrm{4}}$ $^{\mathrm{87}}$Rb atoms. Recently, we have successfully trapped $^{\mathrm{39}}$K on the atom chip, and are working towards cooling it sympathetically via microwave evaporation of rubidium. We intend to exploit the $\mu $/RF potentials for atom interferometry as a spin-dependent beam splitter acting on optically trapped $^{\mathrm{39}}$K in the vicinity of the atom chip.