Research Subgroups


EDM with HfF+ (Gen I & II)

The purpose of this experiment is to make a precision measurement of the electic dipole moment (EDM) of the electron. Because a finite electron EDM violates time symmetry, and thus by the CPT theorem violates CP symmetry as well, a precision upper bound on an electron EDM constrains modelbuilders. In this experiment we use trapped HfF+ molecular ions and use the intermolecular electric field to greatly enhance a potential electron EDM signal.

Resonantly-interacting Bose Gases

In this experimental collaboration with the Ye group (previously with the Jin group) we use an ultracold gas of Rb85 to create a strongly interacting Bose Einstein Condensate. Rb85 has a magnetic Feshbach resonance that can be tuned to create very strong interactions similar to that which can be found in a superfluid, such as liquid helium. We have recently equipped our new generation BEC machine with K39 in addition to Rb85, both of which will provide an ideal platform to study few- and many-body physics.

EDM with ThF+ (Gen III)

ThF+ has been chosen to replace HfF+ in the third-generation JILA electron's Electric Dipole Moment (eEDM) measurement, because of two major advantages: (i) the eEDM-sensitive state (3Δ1) is the ground state, which facilitates a long coherence time; (ii) its effective electric field (35 GV/cm) is 50% larger than that of HfF+, which promises a direct linear increase of the eEDM sensitivity [2]. The major goal of this experiment is to achieve extremely long coherence for precise eEDM measurement. In addition, we also explore new methods to perform state preparation, precision metrology, and state readout with higher efficiency and fidelity.

Past Experiments


EDM Comb Spectroscopy

The Cornell group electron EDM relies on precision spectroscopy of HfF+, a diatomic molecular ion. The spectrum of HfF+, as well as many molecular ions, is not well studied. In collaboration with the Ye group we use an optical frequency comb to perform massively parallel ion sensitive spectroscopy.

Top Trap BEC

In this experiment we use Bose Einstein Condensates to examine the physics of vortices.

Atom Waveguide

In this collaboration with the Anderson group we demonstrate a BEC interferometer in a waveguide.

Hybrid Trap

In this experiment, using a trapped Bose Einstein Condensate of Rb87 we measured the Casimir-Polder force. The Casimir effect is the the phenomenon where surfaces in a vacuum experience an attractive force due to the pressure of virtual particles.