Technical improvements of the existing experimental setup:
The experimental setup has been adapted to produce novel atomtronics structures and these excitations. This has involved implementing far- and near-resonant beams with light-shaping techniques using digital micromirror devices. Therefore, the power, frequency and shape of the potentials can be accurately tuned.
Realization of a spin filter:
By properly choosing the frequency of a near-resonant beam, we have realized a spin-filter for ultracold atoms [2]. We have demonstrated that dissipation effects due to the scattering of photons can be modeled and are not preventing the observation of quantized plateaus of conductance [1].
Investigating possible realizations of topological systems:
In the course of this fellowship, many theory collaborations have been established to fully understand the possibilities offered by the system. This has resulted in the publication of a theoretical proposal on the realization of a Hall geometry using synthetic dimensions [3].
Investigating strongly correlated systems:
In order to realize topological excitations, one needs to combine near-resonant Raman beams together with a paired fermionic superfluid. Previous studies on the experimental setup and theory collaborations have shown the complexity of transport through a structured central region combined with a normal to superfluid transition. Therefore, data is being analyzed on the transport of heat and particles both at unitarity and in non-interacting configurations. In addition, a theory collaboration was established to study the spin drag in transport through a one-dimensional wire with a publication under review [4].
Publications:
[1] Laura Corman, Philipp Fabritius, Samuel Häusler, Jeffrey Mohan, Lena H Dogra, Dominik Husmann, Martin Lebrat, and Tilman Esslinger. Quantized conductance through a dissipative atomic point contact. Physical Review A , 100(5):053605, 2019.
[2] Martin Lebrat, Samuel Häusler, Philipp Fabritius, Dominik Husmann, Laura Corman, and Tilman Esslinger. Quantized conductance through a spin-selective atomic point contact. Physical review letters , 123(19):193605, 2019.
[3] Grazia Salerno, Hannah M Price, Martin Lebrat, Samuel Häusler, Tilman Esslinger, Laura Corman, J-P Brantut, and Nathan Goldman. Quantized hall conductance of a single atomic wire: A proposal based on synthetic dimensions. Physical Review X , 9(4):041001, 2019.
[4] A-M Visuri, M Lebrat, S Häusler, L Corman, and T Giamarchi. Spin transport in a one-dimensional quantum wire. arXiv preprint arXiv:2001.08035 , 2020
The researcher has disseminated the results in 6 presentations (conference contributions / invitations / seminars), as well as during two outreach events.
