Trapped Bose-Bose mixtures at finite temperature: a quantum Monte Carlo approach
We study thermal properties of a trapped Bose-Bose mixture in a dilute regime using quantum Monte Carlo methods. Our main aim is to investigate the dependence of the superfluid density and the condensate fraction on temperature for the mixed and separated phases. To this end we use the diffusion Mon...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2020 |
| 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:2117/341866 |
| Acceso en línea: | https://hdl.handle.net/2117/341866 https://dx.doi.org/10.1103/PhysRevA.102.063304 |
| Access Level: | acceso abierto |
| Palabra clave: | Superfluidity Bose-Einstein condensation Monte Carlo method Bose gases Superfluid density Ultracold gases Quantum Monte Carlo Superfluïdesa Condensació de Bose-Einstein Montecarlo, Mètode de Àrees temàtiques de la UPC::Física |
| Sumario: | We study thermal properties of a trapped Bose-Bose mixture in a dilute regime using quantum Monte Carlo methods. Our main aim is to investigate the dependence of the superfluid density and the condensate fraction on temperature for the mixed and separated phases. To this end we use the diffusion Monte Carlo method in the zero-temperature limit and the path-integral Monte Carlo method for finite temperatures. The results obtained are compared with solutions of the coupled Gross-Pitaevskii equations for the mixture at zero temperature. We notice the existence of an anisotropic superfluid density in some phase-separated mixtures. Our results also show that the temperature evolution of the superfluid density and condensate fraction is slightly different, showing noteworthy situations where the superfluid fraction is smaller than the condensate fraction. |
|---|