SIBG · Strongly Interacting Bose Gases

Strongly Interacting Bose Gases

This project addresses questions of emergent phenomena: How do remarkable properties of matter emerge from complex correlations between the atomic constituents? Specifically, our research is focused on Strongly Interacting Bose Gases (SIBG). The Bose gas is of fundamental significance as a quintessential example of a quantum fluid -- that is, a fluid that occurs at extremely low temperature and whose properties can only be understood within the theory of quantum mechanics. SIBG occur when interactions play a dominant role in the gas when the scattering length or dipole length becomes large with respect to the interparticle spacing. Loss from three-body recombination and instability from attractive interactions present two major obstacles to the experimental creation of SIBG. Recombination processes involve a collision between three atoms that results in a deeply bound two-body dimer and a high-energy atom. Instability arises when attractive interactions overcome the kinetic pressure in the gas, leading to an implosion. This project focuses on improving our understanding of two promising pathways toward SIBG where loss and instability can be suppressed to a manageable level. The first scenario involves gases wherein one has a combination of dipole-dipole forces and s-wave collisions. The second involves temporal manipulation of the interactions in a periodic fashion via the dynamical utilization of a Fano-Feshbach resonance. A complete theoretical understanding of SIBG presents an important fundamental advance in many-body physics. Strong correlations between the atoms make these systems remarkably unique and unusual in many respects, while also providing a formidable scientific challenge. The phase diagram, although not currently understood in its entirety, is likely to be very rich in exotic phases that involve Efimovian trimers, many-body droplets, roton modes, and supersolidity. The task (both theoretical and experimental) is made complicated by instability and loss, but navigating around these obstacles will provide unheralded examples of emergent quantum many-body physics that can play highly specialized roles in future quantum technologies. The overarching objectives of this project are to improve our theoretical understanding of SIBG, with particular focus on scenarios that may feasibly come under experimental investigation in the near future. This includes developing a detailed theory of few-body physics in novel dynamical regimes using Floquet theory.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз