Asymmetric superradiant scattering and abnormal mode amplification induced by atomic density distortion

Area of Science:

• Atomic, Molecular, and Optical Physics
• Quantum Gases
• Condensed Matter Physics

Background:

• Bose-Einstein condensates (BECs) are quantum states of matter with unique properties.
• Superradiance is a quantum optical phenomenon involving collective emission.
• Understanding BEC density profiles is crucial for quantum technologies.

Purpose of the Study:

• To investigate superradiant Rayleigh scattering in a BEC with induced density distortions.
• To explore the relationship between atomic density variations and scattering mode asymmetry.
• To establish superradiance as a tool for probing BEC geometric symmetries.

Main Methods:

• Generating density distortions in a BEC via magnetic forces after trap removal.
• Illuminating the distorted BEC with a pump laser along its short axis.
• Analyzing the resulting superradiant Rayleigh scattering patterns and optical field amplification.
• Performing numerical simulations to validate experimental observations.

Main Results:

• Small variations in BEC atomic density distribution lead to remarkably asymmetric scattering modes.
• The optical field is amplified more significantly in less dense regions of the BEC.
• This amplification differs from conventional mode amplification theories.
• Numerical simulations accurately replicate experimental findings with density envelope distortions.

Conclusions:

• Superradiant Rayleigh scattering is sensitive to subtle geometric asymmetries in BEC density profiles.
• The observed amplification in dilute regions offers new insights into light-matter interactions in BECs.
• This technique provides a novel method for non-destructively characterizing BEC density distributions.