Quantum phase transition of a two-dimensional quadrupolar system
Ensembles with long-range interactions between particles are promising for revealing strong quantum collective effects and many-body phenomena. Here we study the ground-state phase diagram of a two-dimensional Bose system with quadrupolar interactions using a diffusion Monte Carlo technique. We pred...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/353452 |
| Acceso en línea: | https://hdl.handle.net/2117/353452 https://dx.doi.org/10.1103/PhysRevB.103.L140101 |
| Access Level: | acceso abierto |
| Palabra clave: | Phase transformations (Statistical physics) Monte Carlo method Bose-Einstein condensation Phase transitions Bose-Einstein condensates Diffusion quantum Monte Carlo Transicions de fase (Física estadística) Montecarlo, Mètode de Condensació de Bose-Einstein Àrees temàtiques de la UPC::Física |
| Sumario: | Ensembles with long-range interactions between particles are promising for revealing strong quantum collective effects and many-body phenomena. Here we study the ground-state phase diagram of a two-dimensional Bose system with quadrupolar interactions using a diffusion Monte Carlo technique. We predict a quantum phase transition from a gas to a solid phase. The Lindemann ratio and the condensate fraction at the transition point are ¿=0.269(4) and n0/n=0.031(4), correspondingly. We observe the strong rotonization of the collective excitation branch in the vicinity of the phase transition point. Our results can be probed using state-of-the-art experimental systems of various nature, such as quasi-two-dimensional systems of quadrupolar excitons in transition metal dichalcogenide trilayers, quadrupolar molecules, and excitons or Rydberg atoms with quadrupole moments induced by strong magnetic fields. |
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