Observation of superradiant light scattering from a phase fluctuating dipolarBose-Einstein condensate
ORAL
Abstract
Collective light scattering in a Bose-Einstein condensate (BEC) has been extensively studied by
using its unique coherence property. However, most experiments have explored superradiant light
scattering 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 combine tunable s-wave scattering
with dipolar interactions in a BEC of Er atoms. By tuning s-wave interaction strength through
the Feshbach resonance, we tune the superradiance threshold with increasing phase fluctuations.
We also observe an asymmetric superradiant scattering in a dipolar BEC by changing the direction
of the external magnetic field. This collective light scattering opens a new way of probing dipolar
quantum liquids in a BEC.
using its unique coherence property. However, most experiments have explored superradiant light
scattering 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 combine tunable s-wave scattering
with dipolar interactions in a BEC of Er atoms. By tuning s-wave interaction strength through
the Feshbach resonance, we tune the superradiance threshold with increasing phase fluctuations.
We also observe an asymmetric superradiant scattering in a dipolar BEC by changing the direction
of the external magnetic field. This collective light scattering opens a new way of probing dipolar
quantum liquids in a BEC.
*We acknowledges the generous support from the Research Grants Councils of HongKong, Guangdong Joint laboratory and the Harilela foundation through 16306119, 16302420,16302821,16306321,16306922, C6005-17G, C6009-20G, RFS2122-6S04 and NHKUST636-22, respectively.
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Presenters
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Mingchen Huang
- Hong Kong University of Science and Tech
- Hong Kong University of Science and Technology