title: Antiferromagnetic Heisenberg Spin Chain of a Few Cold Atoms in a One-Dimensional Trap.
abstract: We report on the deterministic preparation of antiferromagnetic Heisenberg spin chains consisting of up to four fermionic atoms in a one-dimensional trap. These chains are stabilized by strong repulsive interactions between the two spin components without the need for an external periodic potential. We independently characterize the spin configuration of the chains by measuring the spin orientation of the outermost particle in the trap and by projecting the spatial wave function of one spin component on single-particle trap levels. Our results are in good agreement with a spin-chain model for fermionized particles and with numerically exact diagonalizations of the full few-fermion system.
authors.affiliation: Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, DE-69120 Heidelberg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Murmann
authors.affiliation: Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, DE-30167 Hannover, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Deuretzbacher
authors.affiliation: Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, DE-69120 Heidelberg, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Zürn
authors.affiliation: Mathematical Physics and NanoLund, LTH, Lund University, SE-22100 Lund, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Bjerlin
authors.affiliation: Mathematical Physics and NanoLund, LTH, Lund University, SE-22100 Lund, Sweden.
authors.forename: S M
authors.initials: SM
authors.lastname: Reimann
authors.affiliation: Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, DE-30167 Hannover, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Santos
authors.affiliation: Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, DE-69120 Heidelberg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Lompe
authors.affiliation: Physikalisches Institut der Universität Heidelberg, Im Neuenheimer Feld 226, DE-69120 Heidelberg, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Jochim