Dear Colleagues,

In the last few decades ultracold quantum gases have established themselves as ideal platforms to study a plethora of interesting phenomena.

The mixture of two or more components produces much richer and more intriguing scenarios than the simple multiplication of single constituents, especially when there is a non-negligible mutual interaction between them. Many different quantum mixtures have been realized in the laboratory. Experiments can use different hyperfine states or different isotopes of a single element or mix atoms of different atomic species. They allow the study of different combinations of particle statistics (Bose-Bose, Fermi-Fermi, and Bose-Fermi) and a high degree of control over the most important parameters, such as temperature, density, dimensionality, and trap geometry. With the additional flexibility to tune the contact interaction on Feshbach resonances, these systems are extremely powerful for addressing several single particle, few-body, and many-body complex problems in physics. Recently, with the availability of more sophisticated systems, it has become feasible to investigate long-range interactions. Ground-state polar molecules, dipolar mixtures, and ion–atom hybrid systems offer new possibilities for exploring fascinating scenarios.

This Special Issue of Applied Sciences will highlight recent advances in the ultracold quantum gases community regarding the physics of quantum mixtures. The Special Issue will collect theoretical and experimental works dedicated to the study of problems emerging in the different contexts of quantum mixtures, including out-of-equilibrium dynamics and transport phenomena, collective and topological excitations, phase separation, impurities and polarons, quantum droplets, superfluidity across the BCS–BEC crossover, spin superfluidity and supercurrents, strongly interacting systems, and exotic quantum phases.

This Special Issue invites researchers to submit original research and review articles related to the physics of quantum mixtures.

Dr. Chiara D'Errico
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

• quantum gases and mixtures
• impurities and polarons
• hybrid quantum systems
• dipolar quantum mixtures
• quantum droplets
• Feshbach resonances
• heteronuclear polar molecules
• superfluidity
• stability and dynamics of mixed systems