Liquid-liquid transition in a Bose fluid near collapse
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913496430542848 |
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| author | Moroni, Saverio Cinti, Fabio Boninsegni, Massimo Pellicane, Giuseppe Prestipino, Santi |
| author_facet | Moroni, Saverio Cinti, Fabio Boninsegni, Massimo Pellicane, Giuseppe Prestipino, Santi |
| contents | Discovering novel emergent behavior in quantum many-body systems is a main objective of contemporary research. In this paper, we explore the effects on phases and phase transitions of the proximity to a Ruelle-Fisher instability, marking the transition to a collapsed state. To accomplish this, we study by quantum Monte Carlo simulations a two-dimensional system of soft-core bosons interacting through an isotropic finite-ranged attraction, with a parameter $η$ describing its strength. If $η$ exceeds a characteristic value $η_c$, the thermodynamic limit is lost, as the system becomes unstable against collapse. We investigate the phase diagram of the model for $η\lesssimη_c$, finding -- in addition to a liquid-vapor transition -- a first-order transition between two liquid phases. Upon cooling, the high-density liquid turns superfluid, possibly above the vapor-liquid-liquid triple temperature. As $η$ approaches $η_c$, the stability region of the high-density liquid is shifted to increasingly higher densities, a behavior at variance with distinguishable quantum or classical particles. Finally, for $η$ larger than $η_c$ our simulations yield evidence of collapse of the low-temperature fluid for any density; the collapsed system forms a circular cluster whose radius is insensitive to the number of particles. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_16125 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Liquid-liquid transition in a Bose fluid near collapse Moroni, Saverio Cinti, Fabio Boninsegni, Massimo Pellicane, Giuseppe Prestipino, Santi Statistical Mechanics Quantum Physics Discovering novel emergent behavior in quantum many-body systems is a main objective of contemporary research. In this paper, we explore the effects on phases and phase transitions of the proximity to a Ruelle-Fisher instability, marking the transition to a collapsed state. To accomplish this, we study by quantum Monte Carlo simulations a two-dimensional system of soft-core bosons interacting through an isotropic finite-ranged attraction, with a parameter $η$ describing its strength. If $η$ exceeds a characteristic value $η_c$, the thermodynamic limit is lost, as the system becomes unstable against collapse. We investigate the phase diagram of the model for $η\lesssimη_c$, finding -- in addition to a liquid-vapor transition -- a first-order transition between two liquid phases. Upon cooling, the high-density liquid turns superfluid, possibly above the vapor-liquid-liquid triple temperature. As $η$ approaches $η_c$, the stability region of the high-density liquid is shifted to increasingly higher densities, a behavior at variance with distinguishable quantum or classical particles. Finally, for $η$ larger than $η_c$ our simulations yield evidence of collapse of the low-temperature fluid for any density; the collapsed system forms a circular cluster whose radius is insensitive to the number of particles. |
| title | Liquid-liquid transition in a Bose fluid near collapse |
| topic | Statistical Mechanics Quantum Physics |
| url | https://arxiv.org/abs/2402.16125 |