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Quantum Droplets in Two-Dimensional Bose Mixtures at Finite Temperature
G Spada1,2,3, S Pilati2,3, S Giorgini1
1Pitaevskii BEC Center, CNR-<a href="https://ror.org/02dp3a879">INO</a> and Dipartimento di Fisica, <a href="https://ror.org/05trd4x28">Università di Trento</a>, I-38123 Trento, Italy.
Physical Review Letters
|September 6, 2024
Summary
We studied quantum droplet formation in Bose mixtures, finding that superfluidity emerges abruptly with the gas-to-liquid transition. This transition is driven by critical interaction strength in quasi-2D systems.
Area of Science:
- Quantum physics
- Condensed matter physics
- Ultracold atomic gases
Background:
- Quantum droplets are novel states of matter formed in ultracold atomic gases.
- Understanding their formation and properties is crucial for quantum technologies.
Purpose of the Study:
- Investigate quantum droplet formation in attractive Bose mixtures at finite temperatures.
- Determine the equation of state and gas-liquid coexistence in quasi-2D systems.
- Explore the role of quantum scale anomaly and critical interactions.
Main Methods:
- Exact path-integral Monte Carlo simulations.
- Analysis of equilibrium density, pressure-volume relationships, and isothermal curves.
- Comparison between quasi-2D and strictly 2D models.
Main Results:
- Calculated equilibrium densities and equation of state for gas and liquid phases.
- Found excellent agreement between quasi-2D and 2D models.
- Identified critical interaction strength for the first-order gas-to-liquid transition.
- Observed sudden development of superfluid response coinciding with density jump.
Conclusions:
- Quantum droplets exhibit distinct gas-liquid phases with a sharp transition.
- Superfluidity emerges abruptly at the phase transition point.
- The quantum scale anomaly plays a role in the 2D gas-liquid transition.
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