title: Observation of coherent quench dynamics in a metallic many-body state of fermionic atoms.
abstract: Quantum simulation with ultracold atoms has become a powerful technique to gain insight into interacting many-body systems. In particular, the possibility to study nonequilibrium dynamics offers a unique pathway to understand correlations and excitations in strongly interacting quantum matter. So far, coherent nonequilibrium dynamics has exclusively been observed in ultracold many-body systems of bosonic atoms. Here we report on the observation of coherent quench dynamics of fermionic atoms. A metallic state of ultracold spin-polarized fermions is prepared along with a Bose-Einstein condensate in a shallow three-dimensional optical lattice. After a quench that suppresses tunnelling between lattice sites for both the fermions and the bosons, we observe long-lived coherent oscillations in the fermionic momentum distribution, with a period that is determined solely by the Fermi-Bose interaction energy. Our results show that coherent quench dynamics can serve as a sensitive probe for correlations in delocalized fermionic quantum states and for quantum metrology.
authors.affiliation: 1] Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] Institut für Physik, Johannes Gutenberg-Universität, 55099 Mainz, Germany.
authors.forename: Sebastian
authors.initials: S
authors.lastname: Will
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Deepak
authors.initials: D
authors.lastname: Iyer
authors.affiliation: Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: Marcos
authors.initials: M
authors.lastname: Rigol