Schedule Dec 13, 2016
Few-body physics with ultracold magnetic Erbium (experiment)
Simon Baier, Univ. Innsbruck

Strongly magnetic atoms are an ideal system to study few- and many-body quantum phenomena with anisotropic and long-range interactions. In this talk, we will provide an overview on the scattering properties of a lanthanide species, namely Erbium. We will discuss the modification of the Wigner threshold law arising from the long-range character of the dipole-dipole interaction and show how dipolar scattering can be used to drive identical fermions to the quantum degenerate regime [1,2]. Moreover, we will present the peculiar dense spectrum of Feshbach resonances in Erbium and Dysprosium [3], discuss the origin of the effect, and present a detailed measurement of the s-wave scattering length by the use of a three-dimensional optical lattice. Our precise knowledge on the scattering length recently enabled us to study in detail the dipolar interaction in the work frame of the extended Bose-Hubbard model [4], as well as the formation of a macro-droplet of erbium atoms [5]. References:

  1. K. Aikawa, A. Frisch, M. Mark, S. Baier, R. Grimm, and F. Ferlaino, PRL 112, 010404 (2014)
  2. K. Aikawa, A. Frisch, M. Mark, S. Baier, R. Grimm, J.L. Bohn, D.S. Jin, G.M. Bruun, and F. Ferlaino, PRL 113, 263201 (2014)
  3. T. Maier, H. Kadau, M. Schmitt, M. Wenzel, I. Ferrier-Barbut, T. Pfau, A. Frisch, S. Baier, K. Aikawa, L. Chomaz, M. J. Mark, F. Ferlaino, C. Makrides, E. Tiesinga, A. Petrov, S. Kotochigova, PRX 5, 041029 (2015)
  4. S. Baier, M. J. Mark, D. Petter, K. Aikawa, L. Chomaz, Z. Cai, M. Baranov, P. Zoller, F. Ferlaino, Science 352, 201 (2016)
  5. L. Chomaz, S. Baier, D. Petter, M. J. Mark, F. Wätler, L. Santos, F. Ferlaino, PRX 6, 041039 (2016).


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