The excitation to high-lying Rydberg states is investigated in a sample of 87-Rb atoms undergoing the Bose-Einstein condensation phase transition, in the limit that the spatial dimensions of the condensed cloud are smaller than the (Wan-der-Waals) dipole blockade radius. We measure the number of excitations by single ion counting as a function of the dimensions of the condensed and thermal fraction. We observed a distinct decrease in the number of excitations due to the change of the atomic spatial density distribution, from the thermal cloud, through a bimodal distribution, to the condensed cloud. When only the condensed part is present, the average number of excitations measured levels off at around one which is compatible with having a single collective excitation in the condensed cloud.
|Autori:||N Malossi; M M Valado; E Arimondo; O Morsch; D Ciampini|
|Titolo:||Rydberg excitation of a Bose-Einstein condensate|
|Anno del prodotto:||2015|
|Digital Object Identifier (DOI):||10.1088/1742-6596/594/1/012041|
|Appare nelle tipologie:||1.1 Articolo in rivista|