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Accueil du site > Séminaires > Autres > Séminaire de Niko Buchheim (Munich) : « Towards many-body physics with electric dipole-dipole interactions : Ultracold 23Na40K groundstate molecules via detuned STIRAP »

Séminaire de Niko Buchheim (Munich) : « Towards many-body physics with electric dipole-dipole interactions : Ultracold 23Na40K groundstate molecules via detuned STIRAP »

Friday, May 27 at 11:00 - Room 235A, 29 rue d’Ulm (2e etage) 75005 Paris

Abstract :

During the last years we have constructed a novel experimental apparatus to study quantum many-body physics with polar 23Na40K molecules. The anisotropy and long-range character of the dipole-dipole interaction between the molecules should make it possible to observe novel many-body states [1] and to simulate prototypical lattice models of solid state physics [2] that describe quantum magnetism and the microscopic origin of high temperature superconductivity [3]. For this purpose the 23Na40K molecule is particularly well suited, since it is chemically stable in two-body collisions and provides the largest dipole moment of all alkaline-alkaline molecules that obey fermionic quantum statistics.

To date, the preparation of polar groundstate molecules relies on stimulated Raman adiabatic passage (STIRAP) from a shallow bound state (Feshbach molecule) to the rovibronic groundstate bridging an energy gap of 150THz. High transfer efficiencies (>80%) are achieved [4,5,6] in the case of a spectroscopically resolved molecular hyperfine structure that provides an isolated three-level system and therefor a non-decaying darkstate during STIRAP [7].

In this talk I will present an alternative STIRAP transfer scheme that can be applied for intermediate states that do not exhibit a resolved molecular hyperfine structure as well as récent results on groundstate 23Na40K molecules prepared via a 1Pi-3Pi intermediate state.

[1] A. Micheli et al. “Cold polar molecules in two-dimensional traps : Tayloring interactions with external fields for novel quantum phases”. Phys. Rev. A 76 (4 2007)

[2] A. V. Gorshkov et al. “Tunable Superfluidity and Quantum Magnetism with ultracold Polar Molecules”. Phys. Rev. Lett. 107 (11 2011)

[3] P. A. Lee et al. “Doping a Mott insulator : Physics of high-temperature superconductivity”. Rev. Mod. Phys. 78 (1 2006)

[4] K.K. Ni et al. “A High Phase-Space-Density Gas of Polar Molecules”. Science 322.5899 (2008)

[5] T. Takekoshi et al. “Ultracold Dense Samples of Dipolar RbCs Molecules in the Rovibrational and Hyperfine Ground State”. Phys. Rev. Lett. 113 (20 2014)

[6] J.W. Park et al. “Ultracold Dipolar Gas of Fermionic 23Na40K Molecules in Their Absolute Groundstate”. Phys Rev. Lett. 114 (20 2015)

[7] K. Bergmann “Coherent population transfer among quantum states of atoms and molecules ”. Rev. Mod. Phys. 70 (3 1998)