Rydberg excitation of a Bose-Einstein condensate

23rd International Laser Physics Workshop

Malossi, N.^1,2,3,4 ; Valado, M.M.^1,2 ; Arimondo, E.^1,2,3 ; Morsch, O.^1,2 ; Ciampini, D.^1,2,3

Dipartimento di Fisica 'E. Fermi', Università di Pisa, Largo Pontecorvo 3, Pisa

56127, Italy^1

INO-CNR, Via G. Moruzzi 1, Pisa

56124, Italy^2

CNISM UdR Pisa, Dipartimento di Fisica 'E. Fermi', Università di Pisa, Largo Pontecorvo 3, Pisa

56127, Italy^3

Scuola di Scienze e Tecnologie, Sezione di Fisica, Università di Camerino, I-62032 (MC), Italy^4

关键词: Bimodal distribution;    Bose-Einstein condensates;    Bose-Einstein condensation phase transitions;    Collective excitations;    Rydberg excitation;    Single ion counting;    Spatial densities;    Spatial dimension;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/594/1/012041/pdf
DOI  :  10.1088/1742-6596/594/1/012041

来源: IOP

【 摘 要 】

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.