%0 Journal Article %1 Trebbia2006Experimental %A Trebbia, J. B. %A Esteve, J. %A Westbrook, C. I. %A Bouchoule, I. %D 2006 %I American Physical Society %J Physical Review Letters %K bec, hartree-fock %N 25 %P 250403+ %R 10.1103/physrevlett.97.250403 %T Experimental Evidence for the Breakdown of a Hartree-Fock Approach in a Weakly Interacting Bose Gas %U http://dx.doi.org/10.1103/physrevlett.97.250403 %V 97 %X We investigate the physics underlying the presence of a quasicondensate in a nearly one dimensional, weakly interacting trapped atomic Bose gas. We show that a Hartree-Fock (mean-field) approach fails to predict the existence of the quasicondensate in the center of the cloud: the quasicondensate is generated by interaction-induced correlations between atoms and not by a saturation of the excited states. Numerical calculations based on Bogoliubov theory give an estimate of the crossover density in agreement with experimental results.

@article{Trebbia2006Experimental, abstract = {{We investigate the physics underlying the presence of a quasicondensate in a nearly one dimensional, weakly interacting trapped atomic Bose gas. We show that a Hartree-Fock (mean-field) approach fails to predict the existence of the quasicondensate in the center of the cloud: the quasicondensate is generated by interaction-induced correlations between atoms and not by a saturation of the excited states. Numerical calculations based on Bogoliubov theory give an estimate of the crossover density in agreement with experimental results.}}, added-at = {2019-02-26T15:22:34.000+0100}, author = {Trebbia, J. B. and Esteve, J. and Westbrook, C. I. and Bouchoule, I.}, biburl = {https://www.bibsonomy.org/bibtex/2ac11d30d4e55b42e504ac74dbd63056d/rspreeuw}, citeulike-article-id = {2154646}, citeulike-linkout-0 = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000097000025250403000001\&idtype=cvips\&gifs=yes}, citeulike-linkout-1 = {http://link.aps.org/abstract/PRL/v97/e250403}, citeulike-linkout-2 = {http://dx.doi.org/10.1103/physrevlett.97.250403}, citeulike-linkout-3 = {http://link.aps.org/abstract/PRL/v97/i25/e250403}, citeulike-linkout-4 = {http://link.aps.org/pdf/PRL/v97/i25/e250403}, doi = {10.1103/physrevlett.97.250403}, interhash = {c279eed96938696a745472d7ae3676c1}, intrahash = {ac11d30d4e55b42e504ac74dbd63056d}, journal = {Physical Review Letters}, keywords = {bec, hartree-fock}, month = dec, number = 25, pages = {250403+}, posted-at = {2007-12-21 08:43:02}, priority = {2}, publisher = {American Physical Society}, timestamp = {2019-02-26T15:22:34.000+0100}, title = {{Experimental Evidence for the Breakdown of a Hartree-Fock Approach in a Weakly Interacting Bose Gas}}, url = {http://dx.doi.org/10.1103/physrevlett.97.250403}, volume = 97, year = 2006 }