title: Coherent interaction of a single fermion with a small bosonic field.
abstract: We have experimentally studied few-body impurity systems consisting of a single fermionic atom and a small bosonic field on the sites of an optical lattice. Quantum phase revival spectroscopy has allowed us to accurately measure the absolute strength of Bose-Fermi interactions as a function of the interspecies scattering length. Furthermore, we observe the modification of Bose-Bose interactions that is induced by the interacting fermion. Because of an interference between Bose-Bose and Bose-Fermi phase dynamics, we can infer the mean fermionic filling of the mixture and quantify its increase (decrease) when the lattice is loaded with attractive (repulsive) interspecies interactions.
authors.affiliation: Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany. sebastian.will@lmu.de
authors.forename: Sebastian
authors.initials: S
authors.lastname: Will
authors.forename: Thorsten
authors.initials: T
authors.lastname: Best
authors.forename: Simon
authors.initials: S
authors.lastname: Braun
authors.forename: Ulrich
authors.initials: U
authors.lastname: Schneider
authors.forename: Immanuel
authors.initials: I
authors.lastname: Bloch