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Radio-Frequency Spectroscopy of a Mass-Imbalanced Fermi-Fermi Mixture: Measuring Atom-Dimer Interactions

Marko Cetina, Michael Jag, Matteo Zaccanti +5 more

Bulletin of the American Physical SocietyJun 6, 20130 citations

Phases and transport in spin- and mass-imbalanced Fermi mixtures in one dimension

Binbin Tian, Yuchi He, Michelle Tomczyk +5 more

Bulletin of the American Physical SocietyMar 16, 20170 citations

Observation of a Strong Atom-Dimer Attraction in a Mass-Imbalanced Fermi-Fermi Mixture

Michael Jag, Matteo Zaccanti, Marko Cetina +5 more

We investigate a mixture of ultracold fermionic K40 atoms and weakly bound Li6K40 dimers on the repulsive side of a heteronuclear atomic Feshbach resonance. By radio-frequency spectroscopy we demonstrate that the normally repulsive atom-dimer interaction is turned into a strong attraction. The phenomenon can be understood as a three-body effect in which two heavy K40 fermions exchange the light Li6 atom, leading to attraction in odd partial-wave channels (mainly p wave). Our observations show that mass imbalance in a fermionic system can profoundly change the character of interactions as compared to the well-established mass-balanced case.We investigate a mixture of ultracold fermionic K40 atoms and weakly bound Li6K40 dimers on the repulsive side of a heteronuclear atomic Feshbach resonance. By radio-frequency spectroscopy we demonstrate that the normally repulsive atom-dimer interaction is turned into a strong attraction. The phenomenon can be understood as a three-body effect in which two heavy K40 fermions exchange the light Li6 atom, leading to attraction in odd partial-wave channels (mainly p wave). Our observations show that mass imbalance in a fermionic system can profoundly change the character of interactions as compared to the well-established mass-balanced case.

arXiv:1311.5146Physical Review LettersFeb 21, 201464 citations

Two-species fermion mixtures with mass and population imbalance

M. Iskin, Carlos A. R. Sá de Melo

Bulletin of the American Physical SocietyMar 6, 20070 citations

Intercomponent correlations in attractive one-dimensional mass-imbalanced few-body mixtures

Daniel Pęcak, Tomasz Sowiński

Ground-state properties of a few attractively interacting ultracold atoms of different mass confined in a one-dimensional harmonic trap are studied. The analysis is performed in terms of the noise correlation, which captures the two-particle correlations induced by the mutual interactions. Depending on the mass ratio between the components' atoms, the interparticle correlations change their properties significantly from a strong pairlike correlation to an almost uncorrelated phase. This change is accompanied by a simultaneous change in the structure of the many-body ground state. A crucial role of the quantum statistics is emphasized by comparing properties of the Fermi-Fermi mixture with a corresponding Fermi-Bose system.Ground-state properties of a few attractively interacting ultracold atoms of different mass confined in a one-dimensional harmonic trap are studied. The analysis is performed in terms of the noise correlation, which captures the two-particle correlations induced by the mutual interactions. Depending on the mass ratio between the components' atoms, the interparticle correlations change their properties significantly from a strong pairlike correlation to an almost uncorrelated phase. This change is accompanied by a simultaneous change in the structure of the many-body ground state. A crucial role of the quantum statistics is emphasized by comparing properties of the Fermi-Fermi mixture with a corresponding Fermi-Bose system.

arXiv:1809.10980Physical Review AApr 11, 201918 citations

Small Mass- and Trap-Imbalanced Two-Component Fermi Gases

D. Blume

Bulletin of the American Physical SocietyMay 29, 20080 citations

Attractive atom-dimer interaction in a mass-imbalanced Fermi-Fermi mixture

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