Observation of superradiance in a dipolar Bose-Einstein condensate of <sup>168</sup>Er atoms
ORAL
Abstract
Matter-wave superradiance, a cooperative emission process providing directional scattered atom clouds, has been studied in various systems ranging from weakly interacting Bose-Einstein condensates and free fermions to degenerate quantum gases coupled to the cavity mode. To date, however, most experiments have explored superradiance with closed-shell atoms (e.g. alkali and alkaline-earth-like atoms) in the regime where only s-wave interactions are present. Here, we experimentally examine a superradiance phenomenon in an interacting dipolar Bose gas of 168Er atoms. By tuning s-wave interaction strength through the Feshbach resonance, we explore how the interplay between s-wave and dipolar interactions affects superradiance processes. A detailed analysis of the superradiance process when the external magnetic field breaks the symmetry will be presented. Furthermore, we disscuss the suppression of the superradiance due to the occurrence of the phase fluctuation.
*G.B.J acknowledges the generous support from the Research Grants Councils of Hong Kong, the Croucher Foundation, Guangdong Joint laboratory and the Harilela foundation through 16304918, 16308118, 16306119, 16302420,16302821, C6005-17G, C6009-20G, RFS2122-6S04 and N-HKUST601/17, respectively. P.C. acknowledges the additional support from the Research Grants Councils of Hong Kong (16306321)
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Presenters
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Bojeong Seo
- Hong Kong University of Science and Tech
- Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China