Liquids are ubiquitous in Nature: from the water that we consume daily to superfluid helium which is a quantum liquid appearing at temperatures as low as only a few degrees above the absolute zero. A common feature of these vastly different liquids is being self-bound in free space in the form of droplets. Understanding from a microscopic perspective how a liquid is formed by adding particles one by one is a significant challenge.
Recently, a new type of quantum droplets has been experimentally observed in ultracold atomic systems. These ones are made of alkaline atoms which are cooled down to extremely low temperatures of the order of nanokelvins. The main peculiarity of these systems is that they are the most dilute liquids ever experimentally observed. An extraordinary experimental control over the system opens the possibility of unraveling the mechanism leading to the formation of quantum droplets.
In a recent article published in Physical Review Letters, UB researchers, Ivan Morera and the late Prof. Artur Polls led by Prof. Bruno Juliá-Díaz, in collaboration with Prof. Grigori Astrakharchik from UPC, present a microscopic theory of lattice quantum droplets which explains their formation.
The team of researchers has shown that the formation of the quantum droplet can be explained in terms of effective interactions between dimers (bound states of two particles). Moreover, by solving the four-body problem they have shown that tetramers (bound states of four particles) can appear and they can be interpreted as simple bound states of two dimers.
The properties of these tetramers already coincide with the ones of large quantum droplets which indicates that many of the feature properties of the many-body liquid are contained in the tetramer. They also discussed the possibility of observing these strongly correlated droplets in dipolar bosons or bosonic mixtures in optical lattices.
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Coordinated by ICFO, QuantumCAT includes leading research institutions in Catalonia, such as ICFO itself, the Autonomous University of Barcelona (UAB), the Polytechnic University of Catalonia · BarcelonaTech (UPC), the Institute of Cosmos Sciences of the University of Barcelona (ICC-UB), the Fundació i2CAT, the Barcelona Supercomputing Center (BSC), the Catalan Institute of Nanoscience and Nanotechnology (ICN2), and together with the Institute of High Energy Physics (IFAE) and the National Center of Microelectronics (CNM) as collaborators.
QuantumCAT receives the support of the Secretaria d'Universitats i Recerca del Departament d'Empresa i Coneixement of the Government of Catalonia and FEDER (001-P-001644). It is part of RIS3CAT, an initiative of the Government of Catalonia. RIS3CAT aims to develop and promote the industrial vision of Catalonia, with an open, competitive and sustainable economy, combining talent, creativity, and a diversified business ecosystem in addition to its own system of research of excellence, in the framework of a dynamic, enterprising and inclusive society. Within the region, there are multinational and local companies, which are considered international leaders and experts in emerging technology sectors.
