Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 41: Ultra-cold atoms, ions and BEC V (with Q)

A 41.7: Vortrag

Freitag, 27. März 2015, 12:30–12:45, M/HS1

Critical temperatures in a gas of Sodium spin-1 atoms — •Tilman Zibold, Vincent Corre, Camille Frapolli, Andrea Invernizzi, Jean Dalibard, and Fabrice Gerbier — Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France

We investigate the Bose-Einstein condensation of a gas of Sodium atoms with spin degree of freedom. The phase transition of the different Zeeman components to the condensed phase occurs in general at different critical temperatures, depending on the (conserved) total magnetization of the sample and quadratic Zeeman energy. The higher critical temperature simply corresponds to the condensation of the majority component. The two lower ones correspond to the appearance of magnetic ordering and generally depend more strongly on direct and exchange interactions. We measure this effect for different magnetizations and in different magnetic fields with good agreement with simple theoretical models.