Year: 2023
Type: article
Abstract: We measure the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities after an expansion in the presence of interactions. We observe tails decaying as 1/k^{4} at large momentum k in the condensate and in the impurity cloud. These algebraic tails originate from the impurity-BEC interaction, but their amplitudes greatly exceed those expected from two-body contact interactions at equilibrium in the trap. Furthermore, in the absence of impurities, such algebraic tails are not found in the BEC density measured after the interaction-driven expansion. These results highlight the key role played by impurities when present, a possibility that had not been considered in our previous work [Chang et al., Phys. Rev. Lett. 117, 235303 (2016)PRLTAO0031-900710.1103/PhysRevLett.117.235303]. Our measurements suggest that these unexpected algebraic tails originate from the nontrivial dynamics of the expansion in the presence of impurity-bath interactions.
Source: Physical Review Letters
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, Simons Foundation, Agence Nationale de la Recherche, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Generalitat de Catalunya, Institució Catalana de Recerca i Estudis Avançats, Institut Universitaire de France, Ministerio de Ciencia e Innovación, European Regional Development Fund, Agencia Estatal de Investigación
Awards: G1175115578, G1301776901, G148081399, G1871477277, G2262748287, Quantum many-body cORrelation in momentUM, G2469010403, G300979063, G34346518, G3480869486, G4179535065, Qubits à Atomes Froids pour la Simulation et le Calcul Quantiques, G425668148, G4526231891, G5080475149, G5599649393, G5806516646, Low dimensional quantum fluids, G628552264, G6803667113, G7084143925, G7466406081, Kavli Institute for Theoretical Physics
OpenAlex ID: W4365139876