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Supersolidity around a Critical Point in Dipolar Bose-Einstein Condensates
Yong-Chang Zhang1, Fabian Maucher1, Thomas Pohl1
1Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK 8000 Aarhus, Denmark.
Physical Review Letters
|August 7, 2019
Summary
We discovered a critical point in dipolar Bose-Einstein condensates where quantum fluctuations cause crystallization. This leads to a new supersolid phase with a honeycomb structure and superfluid properties.
Area of Science:
- Quantum physics
- Condensed matter physics
- Atomic physics
Background:
- Bose-Einstein condensates (BECs) are quantum states of matter.
- Dipolar BECs exhibit unique properties due to long-range dipole-dipole interactions.
- Understanding phase transitions in these systems is crucial for quantum science.
Purpose of the Study:
- To investigate spatial symmetry breaking in dipolar Bose-Einstein condensates.
- To identify critical points and phase transitions in the thermodynamic limit.
- To explore the role of quantum fluctuations in stabilizing novel quantum phases.
Main Methods:
- Theoretical analysis of a dipolar Bose-Einstein condensate in the thermodynamic limit.
- Investigation of spatial symmetry breaking and phase transitions.
- Characterization of quantum fluctuation effects.
Main Results:
- A critical point was identified in the phase diagram, leading to crystallization via a second-order phase transition.
- Quantum fluctuations were found to significantly influence the condensate's behavior.
- A new supersolid phase, characterized by a honeycomb pattern and near-perfect superfluidity, was stabilized.
Conclusions:
- Spatial symmetry breaking in dipolar BECs can lead to crystallization.
- Quantum fluctuations play a vital role in stabilizing exotic quantum phases like supersolids.
- The discovered honeycomb supersolid phase exhibits unique properties relevant to quantum matter research.
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