Seminarium Optyczne

Quantum systems are typically characterized by the inherent fluctuation of their physical properties.The size of these fluctuations is particularly relevant for the case of interacting Bose gases at thetransition to Bose-Einstein condensation. Despite its importance this case has resisted a consistentexperimental and theoretical investigation for decades. In collaboration with the group led byKazimierz Rzążewski we have characterized these fluctuations in an experimentally accessiblerange of aspect ratios, temperatures and atom numbers. Strikingly, we observe fluctuations reducedby 27% below the canonical expectation for a non-interacting gas, revealing the microcanonicalnature of our system. Moreover, we explore the scaling of these fluctuation with atom numberproviding an exponent of 1.134 in a region outside the thermodynamic limit. Our experimentalresults thus set a benchmark for further theoretical calculations under experimental conditions.

Seminarium z użyciem połączenia internetowegohttps://zoom.us/j/97696726563(meeting ID: ID 97696726563, password: 314297)