Towards nano-structured potentials: coupling of an ultra cold atomic gas with a surface and sub-wavelength imaging
Language
en
Autre communication scientifique (congrès sans actes - poster - séminaire...)
This item was published in
International Conférence on Atomic Physics, 2022-07-17, Toronto.
English Abstract
Recently, cold atoms in lattices blossomed as good candidates to mimic the prop- erties of electrons in solid state systems and to simulate other quantum systems. However, experimental techniques currently use optical ...Read more >
Recently, cold atoms in lattices blossomed as good candidates to mimic the prop- erties of electrons in solid state systems and to simulate other quantum systems. However, experimental techniques currently use optical lattices in the far-field. This limit the lattice spacing to λ/2, thus 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 ( ̊A) and far field lattice (500nm) by developing an hybrid quantum system of Bose and Fermi quantum gas in close proximity of a nano-structured surface generating sub-wavelength lattice potentials. To push toward this goal, we first developed a novel method to transport and then trap an ultracold atomic cloud in close vicinity of a surface. We will discuss about the early stage atom-chip produced, and report on some tests about the transport sequence. By measuring the power spectral density of the trap parameters, we can predict the noise- induce heating of the trapped cloud. In order to work with such system, one need to be able to address individually each sites with a resolution under the standard PSF limit. We implemented a tunable sub-wavelength imaging system with a theoretical resolution of 30nm that we used to resolve the wave-packet of a cloud in a single lattice site. This scheme involves two superimposed optical lattices, one at 1064nm and one at 1529nm, whose interfringe can be tuned. We present hereafter the experimental setup in detail and show interesting results we obtained.Read less <
ANR Project
Atomes Ultra-Froids piégés dans des Réseaux Optiques Nano-Structurés - ANR-18-CE47-0001
Conversion micro-onde - optique intégrée sur puce à atomes supraconductrice - ANR-22-QUA2-0003
Conversion micro-onde - optique intégrée sur puce à atomes supraconductrice - ANR-22-QUA2-0003
Origin
Hal imported