Suppression of Unitary Three-Body Loss in a Degenerate Bose-Fermi Mixture

Chen, Xing-Yan; Duda, Marcel; Schindewolf, Andreas; Bause, Roman; Bloch, Immanuel und Luo, Xin-Yu (2022): Suppression of Unitary Three-Body Loss in a Degenerate Bose-Fermi Mixture. In: Physical Review Letters, Bd. 128, Nr. 15, 153401

Abstract

We study three-body loss in an ultracold mixture of a thermal Bose gas and a degenerate Fermi gas. We find that at unitarity, where the interspecies scattering length diverges, the usual inverse-square temperature scaling of the three-body loss found in nondegenerate systems is strongly modified and reduced with the increasing degeneracy of the Fermi gas. While the reduction of loss is qualitatively explained within the few-body scattering framework, a remaining suppression provides evidence for the long-range Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions mediated by fermions between bosons. Our model based on RKKY interactions quantitatively reproduces the data without free parameters, and predicts one order of magnitude reduction of the three-body loss coefficient in the deeply Fermi-degenerate regime.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0031-9007
• Sprache: Englisch