### Session D1: Poster Session I (4:00 pm - 6:00 pm)

4:00 PM–4:00 PM, Tuesday, June 5, 2012
Room: Royal Ballroom

Abstract ID: BAPS.2012.DAMOP.D1.101

### Abstract: D1.00101 : Spinor dynamics in a $^{23}$Na Bose-Einstein condensate

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#### Authors:

Hyewon Pechkis
(JQI, NIST and Univ. of Maryland)

Jonathan Wrubel
(JQI, NIST and Univ. of Maryland)

Paul Griffin
(Univ. of Strathclyde)

Ryan Barnett
(JQI, NIST and Univ. of Maryland)

Eite Tiesinga
(JQI, NIST and Univ. of Maryland)

Paul Lett
(JQI, NIST and Univ. of Maryland)

Spinor Bose-Einstein condensates (BECs) are characterized by an additional internal degree of freedom, which results in a vector order parameter. In particular, this system may be used to produce an internal state matter-wave amplifier, as well as spin-squeezcd states. In order to pursue these goals it is critical to have an accurate measurement of the spin-dependent interaction energy c$_2$, which is proportional to the difference in scattering lengths a$_{F=2}$ and a$_{F=0}$. The spin-dependent interaction energy determines the ground-state structure as well as the dynamical properties of spinor condensates. A recent result used Feshbach resonance measurements in a BEC to create realistic atomic potentials for sodium and yielded a value which is approximately a factor of two larger than the only measurement in a sodium spinor condensate. Here we discuss the difficulties associated with measuring c$_2$ in sodium, as well as a revised measurement from spinor dynamics. In addition we will discuss our experiments on microwave-dressed spinor states, seeded, and unseeded matter-wave amplification.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.DAMOP.D1.101