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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
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P-Band Induced Self-Organization and Dynamics with Repulsively Driven Ultracold Atoms in an Optical Cavity
P Zupancic1, D Dreon1, X Li1
1Institute for Quantum Electronics, Eidgenössische Technische Hochschule Zürich, Otto-Stern-Weg 1, 8093 Zurich, Switzerland.
Physical Review Letters
|December 24, 2019
Summary
We discovered a stable self-ordered phase in a Bose-Einstein condensate coupled to an optical cavity. Atoms order via antisymmetric coupling, leading to unique density patterns and driven-dissipative dynamics.
Area of Science:
- Quantum physics
- Atomic physics
- Condensed matter physics
Background:
- Bose-Einstein condensates (BECs) are quantum states of matter formed by cooling atoms to near absolute zero.
- Coupling BECs to optical cavities can create novel quantum phases and dynamics.
- Optical lattices provide a versatile platform for controlling ultracold atoms.
Purpose of the Study:
- To investigate the behavior of a Bose-Einstein condensate strongly coupled to an optical cavity.
- To identify and characterize emergent phases in this strongly coupled system.
- To understand the underlying mechanisms driving the observed phenomena, including driven-dissipative dynamics.
Main Methods:
- Utilizing a repulsive optical lattice to couple a Bose-Einstein condensate to an optical cavity.
- Detecting the formation of a stable self-ordered phase.
- Analyzing the atomic ordering through antisymmetric coupling to the P band of the lattice.
- Observing and characterizing a nonequilibrium phase with photon bursts.
Main Results:
- A stable self-ordered phase was detected in the strongly coupled Bose-Einstein condensate system.
- Atomic ordering occurs via antisymmetric coupling to the P band, influencing phase extent and density modulation geometry.
- A novel nonequilibrium phase was identified, characterized by intense bursts of intracavity photons.
- Evidence of nontrivial driven-dissipative dynamics was observed.
Conclusions:
- The strong coupling regime between a Bose-Einstein condensate and an optical cavity hosts a stable self-ordered phase.
- Antisymmetric coupling to the P band dictates the properties of the ordered phase.
- The system exhibits complex driven-dissipative dynamics, leading to emergent nonequilibrium phenomena.
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