title: Quantum magnetism in strongly interacting one-dimensional spinor Bose systems.
abstract: Strongly interacting one-dimensional quantum systems often behave in a manner that is distinctly different from their higher-dimensional counterparts. When a particle attempts to move in a one-dimensional environment it will unavoidably have to interact and 'push' other particles in order to execute a pattern of motion, irrespective of whether the particles are fermions or bosons. A present frontier in both theory and experiment are mixed systems of different species and/or particles with multiple internal degrees of freedom. Here we consider trapped two-component bosons with short-range inter-species interactions much larger than their intra-species interactions and show that they have novel energetic and magnetic properties. In the strongly interacting regime, these systems have energies that are fractions of the basic harmonic oscillator trap quantum and have spatially separated ground states with manifestly ferromagnetic wave functions. Furthermore, we predict excited states that have perfect antiferromagnetic ordering. This holds for both balanced and imbalanced systems, and we show that it is a generic feature as one crosses from few- to many-body systems.
authors.affiliation: Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Amin
authors.initials: A
authors.lastname: Dehkharghani
authors.affiliation: Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Artem
authors.initials: A
authors.lastname: Volosniev
authors.affiliation: Department of Fundamental Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Lindgren
authors.affiliation: Department of Fundamental Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
authors.forename: Jimmy
authors.initials: J
authors.lastname: Rotureau
authors.affiliation: 1] Department of Fundamental Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden [2] Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA [3] Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors.forename: Christian
authors.initials: C
authors.lastname: Forssén
authors.affiliation: Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Dmitri
authors.initials: D
authors.lastname: Fedorov
authors.affiliation: Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Aksel
authors.initials: A
authors.lastname: Jensen
authors.affiliation: Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Nikolaj
authors.initials: N
authors.lastname: Zinner