Strongly Interacting Mass Imbalanced Superfluid with ultracold fermions

Project Information

SIMIS

Grant agreement ID: 894429

DOI

10.3030/894429

Project terminated on 30 November 2020

EC signature date 24 February 2020

Start date 1 July 2020

End date 30 June 2022

Funded under

• EXCELLENT SCIENCE - Marie Skłodowska-Curie Actions

Total cost

€ 174 167,04

EU contribution

€ 174 167,04

Coordinated by

UNIVERSITAET INNSBRUCK
Austria

Periodic Reporting for period 1 - SIMIS (Strongly Interacting Mass Imbalanced Superfluid with ultracold fermions)

Reporting period: 2020-07-01 to 2022-06-30

Summary of the context and overall objectives of the project

The project aims at novel superfluid states in mixtures of ultracold fermionic atoms. Using different atomic species introduces mass imbalance into the problem, which according to theoretical predictions favors the emergence of unconventional superfluids. Such superfluids have been widely discussed in the theoretical literature, but have been elusive in the lab. With the mixture of dysprosium and potassium atoms, we have introduced a new and very promising platform for experimental research along these lines. A central objective is the realization of the first mass-imbalanced superfluid system of fermions.

Work performed from the beginning of the project to the end of the period covered by the report and main results achieved so far

In the first 5 months of the project we have optimized the preparation process of a deeply quantum-degenerate sample. This involves laser cooling and trapping and novel schemes of evaporative cooling of the quantum mixture. Moreover, we have developed schemes for the efficient tuning of interactions between the two components via a quantum-mechanical resonance (so-called Feshbach resonance). In this way, we have reached the major milestone of a strongly interacting mixture of fermionic dysprosium and potassium atoms.

Progress beyond the state of the art and expected potential impact (including the socio-economic impact and the wider societal implications of the project so far)

We have created the first quantum-degenerate, strongly interacting mixture of ultracold fermionic atoms with different masses, and we expect to reach the superfluid state in further experiments. As a wider impact, the project will provide deeper understanding of exotic mechanisms that lead to superfluidity and superconductivity in new materials.

Effect of strong interactions on the spatial profile of fermionic K atoms mixed with Dy atoms