{"id":385427,"date":"2017-05-22T06:41:06","date_gmt":"2017-05-22T13:41:06","guid":{"rendered":"https:\/\/newed.any0.dpdns.org\/en-us\/research\/?post_type=msr-research-item&p=385427"},"modified":"2018-10-16T20:11:15","modified_gmt":"2018-10-17T03:11:15","slug":"stability-unitary-bose-gas","status":"publish","type":"msr-research-item","link":"https:\/\/newed.any0.dpdns.org\/en-us\/research\/publication\/stability-unitary-bose-gas\/","title":{"rendered":"Stability of a Unitary Bose Gas"},"content":{"rendered":"

We study the stability of a thermal 39<\/span><\/span><\/span>K<\/span><\/span><\/span><\/span><\/span><\/span> <\/span> Bose gas across a broad Feshbach resonance, focusing on the unitary regime, where the scattering length a<\/span><\/span><\/span><\/span><\/span> <\/span> exceeds the thermal wavelength \u03bb<\/span><\/span><\/span><\/span><\/span> <\/span>. We measure the general scaling laws relating the particle-loss and heating rates to the temperature, scattering length, and atom number. Both at unitarity and for positive a<\/span><\/span>\u226a<\/span><\/span>\u03bb<\/span><\/span><\/span><\/span><\/span> <\/span> we find agreement with three-body theory. However, for a<\/span><\/span><<\/span><\/span>0<\/span><\/span><\/span><\/span><\/span> <\/span> and away from unitarity, we observe significant four-body decay. At unitarity, the three-body loss coefficient, L<\/span><\/span><\/span>3<\/span><\/span><\/span><\/span>\u221d<\/span><\/span>\u03bb^<\/span><\/span><\/span>4<\/span><\/span><\/span><\/span><\/span><\/span><\/span> <\/span>, is 3 times lower than the universal theoretical upper bound. This reduction is a consequence of species-specific Efimov physics and makes 39<\/span><\/span><\/span>K<\/span><\/span><\/span><\/span><\/span><\/span> <\/span> particularly promising for studies of many-body physics in a unitary Bose gas.<\/p>\n","protected":false},"excerpt":{"rendered":"

We study the stability of a thermal 39K Bose gas across a broad Feshbach resonance, focusing on the unitary regime, where the scattering length a exceeds the thermal wavelength \u03bb . We measure the general scaling laws relating the particle-loss and heating rates to the temperature, scattering length, and atom number. Both at unitarity and […]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"Phys. Rev. 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