Intermittent implosion and pattern formation of trapped Bose-Einstein condensates with an attractive interaction

Area of Science:

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

Background:

• Bose-Einstein condensates (BECs) are quantum states of matter formed by cooling bosons to near absolute zero.
• Understanding the dynamics of BECs, especially under attractive interactions leading to collapse, is crucial for quantum simulation and precision measurement.
• Previous studies have explored BEC collapse, but specific dynamic phenomena remain underexplored.

Purpose of the Study:

• To investigate the previously unobserved dynamic phenomena during the collapse of a trapped Bose-Einstein condensate with attractive interactions.
• To characterize the formation of density structures when the interatomic interaction is rapidly tuned from repulsive to attractive.

Main Methods:

• Utilizing a trapped Bose-Einstein condensate with tunable interatomic interactions, controlled via Feshbach resonance.
• Observing the collapsing dynamics through in-situ imaging and time-of-flight measurements.
• Analyzing density fluctuations and their evolution during the transition to attractive interactions.

Main Results:

• Observed two novel phenomena during BEC collapse: intermittent, rapid implosions within a localized region.
• Demonstrated that switching interaction from repulsive to attractive induces growth of density fluctuations.
• Identified the formation of various patterns, including a distinct shell structure, from these fluctuations.

Conclusions:

• The study reveals previously unknown dynamical behaviors of Bose-Einstein condensates under attractive interactions.
• The findings provide new insights into pattern formation and instability in quantum gases.
• This work opens avenues for controlling quantum gas properties and exploring complex many-body physics.