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Liquid-Liquid Transition in a Bose Fluid near Collapse
Saverio Moroni1, Fabio Cinti2,3,4, Massimo Boninsegni5
1CNR-IOM DEMOCRITOS, Istituto Officina dei Materiali and <a href="https://ror.org/004fze387">SISSA Scuola Internazionale Superiore di Studi Avanzati</a>, Via Bonomea 265, I-34136 Trieste, Italy.
Physical Review Letters
|September 13, 2024
Summary
Researchers studied quantum many-body systems near collapse. They found a new liquid-liquid transition and superfluidity in bosons, revealing unique behaviors under attractive interactions.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Statistical Mechanics
Background:
- Discovering emergent behavior in quantum many-body systems is crucial.
- Ruelle-Fisher instability signals a transition to a collapsed state.
Purpose of the Study:
- Investigate phase transitions in soft-core bosons near Ruelle-Fisher instability.
- Explore the impact of attractive interactions on system stability and phases.
Main Methods:
- Quantum Monte Carlo simulations were employed.
- A two-dimensional system of soft-core bosons with tunable attraction was studied.
Main Results:
- A liquid-vapor transition and a first-order liquid-liquid transition were identified.
- Superfluidity was observed in the high-density liquid phase upon cooling.
- System stability shifted to higher densities as attraction increased, differing from classical systems.
Conclusions:
- Proximity to Ruelle-Fisher instability induces novel phases and transitions in quantum bosons.
- The system exhibits unique density-dependent behavior and eventual collapse into a cluster.
- Findings offer insights into quantum systems near instability thresholds.
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