Repulsively-bound exciton-biexciton states in high-spin fermions in optical lattices

Abstract

We show that the interplay between spin-changing collisions and quadratic Zeeman coupling provides a novel mechanism for the formation of repulsively bound composites in high-spin fermions, which we illustrate by considering spin flips in an initially polarized hard-core 1D Mott insulator of spin-3/2 fermions. We show that after the flips the dynamics is characterized by the creation of two types of exciton-biexciton composites. We analyze the conditions for the existence of these bound states, and discuss their intriguing properties. In particular we show that the effective mass and stability of the composites depends non-trivially on spin-changing collisions, on the quadratic Zeeman effect and on the initial exciton localization. Finally, we show that the composites may remain stable against inelastic collisions, opening the possibility of novel quantum composite phases.

5 pages, 6 figures

References in corpus (19)

• Many-Body Physics with Ultracold Gases
• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Ultracold atomic gases in optical lattices: mimicking condensed matter physics and beyond
• A quantum gas microscope - detecting single atoms in a Hubbard regime optical lattice
• Single-Atom Resolved Fluorescence Imaging of an Atomic Mott Insulator
• Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate
• Repulsively bound atom pairs in an optical lattice
• DMRG and periodic boundary conditions: a quantum information perspective
• Ultracold fermions and the SU(N) Hubbard model
• Ultracold Gases of Ytterbium: Ferromagnetism and Mott States in an SU(6) Fermi System
• Color Superfluidity and "Baryon" Formation in Ultracold Fermions
• Competing orders in one dimensional spin 3/2 fermionic systems
• Quantitative Determination of Temperature in the Approach to Magnetic Order of Ultracold Fermions in an Optical Lattice
• Microwave-induced Fano-Feshbach resonances
• Quantum liquid of repulsively bound pairs of particles in a lattice
• Parametric amplification of vacuum fluctuations in a spinor condensate
• Spin 3/2 fermions with attractive interactions in a one-dimensional optical lattice: phase diagrams, entanglement entropy, and the effect of the trap
• Confinement vs Deconfinement of Cooper Pairs in One-Dimensional Spin-3/2 Fermionic Cold Atoms
• Equation of state of a polarized Fermi gas in the Bose-Einstein Condensate limit