Exploring quantum fluctuations in cold atom systems

Project funded by Croatian Science Foundation (HRZZ) (Research Projects), grant IP-2022-10-6144. Participating organisations named by the source: Prirodoslovno-matematički fakultet u Splitu. Funded amount: EUR 152,650, as stated by the source. Runs 2023-12-18 to 2027-12-17. Keywords: ultradilute droplets, quantum fluctuations, Bose-Einstein condensate, quantum Monte Carlo, density functional theory. Source: OpenAIRE Graph, from the funder's project data (collected by OpenAIRE on 2025-08-01); national funding data, not CORDIS. Abstract given by the source: Ultra-dilute droplets of Bose-Bose mixtures that have been recently discovered in systems of cold atoms owe their stability to quantum fluctuations. In our previous research we have shown that first principle many-body approach, combining quantum Monte Carlo simulations and density functional theory enables reliable prediction of their properties. In this project we want to take a step forward in developing quantum Monte Carlo methods with the goal of exploring the effects of quantum fluctuations in three particularly interesting systems. First, for compressed droplets of Bose-Bose mixtures we want to determine excitations, study vortices and investigate the behaviour of impurities. Second, we want to explore static and dynamic behaviour of cold atoms in periodic and quasi-periodic potentials, with emphasis on ultradilute droplets. Quantum fluctuations in these systems are only starting to be explored, and we expect new phases to be uncovered. We plan also to study dynamics after quenching lattice potential or interaction to understand the role of interactions in quasi-periodic systems far from equilibrium. Non-equilibrium many-body physics has become the focus of many quantum gas experiments and tVMC is ideally suited to simulate them. For chosen systems we will determine the changes of phase diagram with temperature, which will besides the community of ultracold atoms give valuable insight to the community studying adsorption of quantum fluids on substrates. Third, using diffusion Monte Carlo we will study the Bose-Fermi mixture. Varying the interaction we hope to discover and characterize the regime of ultra dilute liquid. We expect our research will be useful for guiding and interpreting future experiments.

Original source.

Source: OpenAIRE Graph: projects of national funders, OpenAIRE, from the project data of Croatian Science Foundation (HRZZ). Retrieved 2026-10-28. Licence: Creative Commons Attribution 4.0 (OpenAIRE Graph). Selected metadata, adapted presentation; the publisher's record is authoritative. No endorsement by the source is implied. Licence: Creative Commons Attribution 4.0 (CC BY 4.0).

AI-assisted summary: The project "Exploring quantum fluctuations in cold atom systems" is funded by the Croatian Science Foundation with a grant of EUR 152,650, running from 2023-12-18 to 2027-12-17. It focuses on studying quantum fluctuations in Bose-Bose mixtures using advanced simulation methods. Suggested technology pillar: simulation. Generated by AI from the public source text; it may contain errors and the original source is authoritative.