Towards a quantum Monte Carlo-based density functional including finite-range effects: excitation modes of a K 39 quantum droplet
Some discrepancies between experimental results on quantum droplets made of a mixture of 39K atoms in different hyperfine states and their analysis within extended Gross-Pitaevskii theory (which incorporates beyond mean-field corrections) have been recently solved by introducing finite-range effects...
| Autores: | , , , , |
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| 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:2117/336779 |
| Acceso en línea: | https://hdl.handle.net/2117/336779 https://dx.doi.org/10.1103/PhysRevA.102.033335 |
| Access Level: | acceso abierto |
| Palabra clave: | Monte Carlo method Condensed matter Mixtures of atomic and/or molecular quantum gases Quantum fluids & solids Interdisciplinary physics Condensed matter & materials physics Atomic molecular & optical Gross-Pitaevskii theory Montecarlo, Mètode de Matèria condensada Àrees temàtiques de la UPC::Física |
| Sumario: | Some discrepancies between experimental results on quantum droplets made of a mixture of 39K atoms in different hyperfine states and their analysis within extended Gross-Pitaevskii theory (which incorporates beyond mean-field corrections) have been recently solved by introducing finite-range effects into the theory. Here we study the influence of these effects on the monopole and quadrupole excitation spectrum of extremely dilute quantum droplets using a density functional built from first-principles quantum Monte Carlo calculations, which can be easily introduced in the existing Gross-Pitaevskii numerical solvers. Our results show differences of up to 20% with those obtained within the extended Gross-Pitaevskii theory, likely providing another way to observe finite-range effects in mixed quantum droplets by measuring their lowest excitation frequencies. |
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