### Session L1: Poster Session II (4:00 pm - 6:00 pm)

4:00 PM–4:00 PM, Wednesday, June 15, 2011
Room: Atrium Ballroom BC

Abstract ID: BAPS.2011.DAMOP.L1.171

### Abstract: L1.00171 : A K-Rb-$^{21}$Ne Comagnetometer for Tests of Fundamental Symmetries and Inertial Rotation Sensing

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#### Authors:

Justin Brown
(Princeton University)

Marc Smiciklas
(Princeton University)

Lawrence Cheuk
(Princeton University)

Michael Romalis
(Princeton University)

The K-$^3$He noble gas comagnetometer has already set the most stringent limit on possible Lorentz and CPT violation coupling to nuclear spin and on long-range nuclear spin-dependant forces. The comagnetometer is mounted on a rotating platform for reorientation of the sensitive axis in the horizontal plane that is a key to improved tests of spatial isotropy. Replacement of $^3$He with $^{21}$Ne provides an order of magnitude improvement in sensitivity to non-magnetic nuclear spin interactions due the smaller gyromagnetic ratio of $^{21}$Ne. Because $^{21}$Ne has $I=3/2$, the experiment is also sensitive to tensor Lorentz-violating effects that do not break CPT symmetry. The comagnetometer also works as a sensitive gyroscope that is potentially competitive with fiber-optic and atomic Sagnac interferometers. We will describe our current development of the K-Rb-$^{21}$Ne comagnetometer as a gyroscope and a precision measurement tool. Finally, we discuss the advantage and future plans for Lorentz Violation tests at the South Pole for removal of Earth's rotation rate as a background systematic effect.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DAMOP.L1.171