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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
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Extended Bose-Hubbard models with ultracold magnetic atoms
Summary
Researchers studied the extended Bose-Hubbard model using magnetic erbium atoms. They observed long-range interactions and their effect on quantum phase transitions in strongly correlated materials.
Area of Science:
- Quantum physics
- Condensed matter physics
- Atomic physics
Background:
- The Hubbard model is fundamental to understanding strongly correlated materials.
- Standard Hubbard models typically include only onsite interactions.
- Extending the model to include long-range interactions is predicted to significantly change quantum system behavior.
Purpose of the Study:
- To experimentally realize and investigate the extended Bose-Hubbard model.
- To explore the influence of long-range interactions on quantum phase transitions.
- To study the anisotropic properties of interactions and dynamics in a dipolar quantum gas.
Main Methods:
- Utilizing an ultracold gas of strongly magnetic erbium atoms.
- Confining the atoms in a three-dimensional optical lattice.
- Controlling the orientation of atomic dipoles to tune interactions.
Main Results:
- Demonstrated the extended Bose-Hubbard model with dipolar interactions.
- Revealed anisotropic onsite interactions and hopping dynamics.
- Observed nearest-neighbor interactions, a direct result of long-range dipolar forces.
- Investigated the impact on the superfluid-to-Mott insulator quantum phase transition.
Conclusions:
- The study successfully implemented the extended Bose-Hubbard model with magnetic atoms.
- Long-range interactions significantly influence quantum phase transitions.
- The findings pave the way for exploring novel many-body quantum phases.
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