Cold atoms in lattices have appeared as good candidates to mimic the properties of electrons in solid-state systems and to simulate quantum materials. However, experimental techniques currently use optical lattices in the far-field. This limits the lattice spacing to λ/2 and gives an upper bound to the relevant energy scale (tunneling and interaction), making it difficult to enter deeply into the proper quantum regimes to observe magnetic quantum correlations or strongly correlated phases. Our project aims at reducing the lattice period to bridge the gap between solid-state (Å) and far-field lattice (500nm) by developing a hybrid quantum system of Bose and Fermi quantum gas in close proximity of a nanostructured surface generating sub-wavelength lattice potentials. To push toward this goal, we have developed a novel method to transport and trap an ultracold atomic cloud in the vicinity of a surface. In this poster, we will discuss the design of the first atom-chip that will implement this method, and report on tests about the transport sequence. In particular, by measuring the power spectral density of the trap parameters, we predict the noise-induced heating of the trapped cloud. Subwavelength lattice analysis requires addressing each site individually with a resolution better than the diffraction limit. For that purpose, we implemented a tunable sub-wavelength imaging system with a theoretical resolution of 30nm and we demonstrated its performance by resolving the wave-packet of a cloud in a single lattice site. This scheme involves two superimposed optical lattices at 1064nm and 1529nm, whose interfringe can be tuned. In the poster, the experimental setup will be presented, and the data will be compared to the theoretical expectation.
|Presenter name||Gerent Jean-Baptiste|
|How will you attend ICAP-27?||I am planning on in-person attendance|