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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Pattern Formation and Exotic Order in Driven-Dissipative Bose-Hubbard Systems.

Zijian Wang^1,2, Carlos Navarrete-Benlloch^1,3, Zi Cai^1,3,4

¹Wilczek Quantum Center, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.

Physical Review Letters

|September 25, 2020

Summary

Researchers explored exotic bosonic states in driven-dissipative systems. They discovered a novel superfluid state with bosons condensing on a ring in momentum space, offering new avenues for quantum many-body physics research.

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Area of Science:

Condensed Matter Physics
Quantum Many-Body Systems
Quantum Optics

Background:

Superconducting circuits enable exploration of novel quantum phenomena.
Driven-dissipative systems exhibit complex emergent behaviors.
Bosonic tight-binding models are crucial for understanding quantum systems.

Purpose of the Study:

Investigate unconventional bosonic tight-binding models in driven-dissipative systems.
Characterize emergent exotic bosonic states and their properties.
Propose experimental implementations and stabilization methods.

Main Methods:

Focus on a two-dimensional driven-dissipative Bose-Hubbard model.
Analyze steady states and condensation phenomena.
Examine the interplay of driving, dissipation, and lattice effects.

Main Results:

Observed condensation of bosons on a
Bose surface
in momentum space.
Identified an exotic superfluid state with condensation on a closed ring.
Demonstrated a purely diffusive relaxation spectrum around the condensate.

Conclusions:

The study reveals a novel superfluid state with no classical counterpart.
The findings offer a pathway for experimental realization in superconducting circuits.
This work addresses open problems in condensed-matter physics.