Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 33: Quantum Gases
Q 33.5: Talk
Wednesday, March 16, 2022, 15:00–15:15, Q-H10
From heteronuclear Efimov effect to Fermi polarons - (quasi-) bound states and induced scattering properties — •Michael Rautenberg1, Binh Tran1, Tilman Enss2, Manuel Gerken1, Eleonora Lippi1, Bing Zhu1,3, Juris Ulmanis1, Moritz Drescher2, Manfred Salmhofer2, and Matthias Weidemüller1 — 1Physikalisches Institut, Ruprecht Karl University of Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Institut for Theoretical Physics, Ruprecht Karl University of Heidelberg, Philosophenweg 19, 69120 Heidelberg, Germany — 3Shanghai Branch, University of Science and Technology of China, Shanghai 201315, China
We report on the results of our theoretical investigation of two heavy bosons immersed in a Fermi sea of light fermions. Using the Born-Oppenheimer approximation - allowing an effective few-particle description of this quantum many-body problem - both the bound state spectrum as well as fermion-induced scattering properties of the bosons are investigated. The bound state spectrum is discussed as a function of inter- and intraspecies interactions as well as the fermion density, also including the zero density limit where the system recovers the three-body Efimov spectrum. Numerical calculations of potentials and spectra are performed for the mass ratio of a 6Li-133Cs mixture.
Additionally, we find resonances in the induced boson-boson scattering length at the positions where the in-medium Efimov bound states cross the continuum threshold. For sufficiently large impurity-bath mass ratio, quasibound states can be observed.