Exciton-Polariton scattering for defect detection in cold atom Optical Lattices

Abstract

We study the effect of defects in the Mott insulator phase of ultracold atoms in an optical lattice on the dynamics of resonant excitations. Defects, which can either be empty sites in a Mott insulator state with one atom per site or a singly occupied site for a filling factor two, change the dynamics of Frenkel excitons and cavity polaritons. While the vacancies in first case behave like hard sphere scatters for excitons, singly occupied sites in the latter case can lead to attractive or repulsive scattering potentials. We suggest cavity polaritons as observation tool of such defects, and show how the scattering can be controlled in changing the exciton-photon detuning. In the case of asymmetric optical lattice sites we present how the scattering effective potential can be detuned by the cavity photon polarization direction, with the possibility of a crossover from a repulsive into an attractive potential.

9 pages, 10 figures

References in corpus (10)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Cold bosonic atoms in optical lattices
• The cold atom Hubbard toolbox
• Strong atom-field coupling for Bose-Einstein condensates in an optical cavity on a chip
• Cavity QED with a Bose-Einstein condensate
• Interatomic collisions in a tightly confined Bose gas
• The Mott insulator transition in two dimensions
• Defect-Suppressed Atomic Crystals in an Optical Lattice
• Cavity-enhanced superradiant Rayleigh scattering with ultra-cold and Bose-Einstein condensed atoms
• Excitons and cavity polaritons for ultracold atoms in an optical lattice

Cited by in corpus (11)

• Hybrid Quantum System of a Nanofiber Mode Coupled to Two Chains of Optically Trapped Atoms
• Inelastic Collisions in an Ultracold quasi-2D Gas
• Bright and dark excitons in an atom--pair filled optical lattice within a cavity
• Collective Interactions in an Array of Atoms Coupled to a Nanophotonic Waveguide
• Topology of multiple cross-linked Su-Schrieffer-Heeger chains
• Quantum Phases of Ultracold Bosonic Atoms in two Bands of an Optical-Lattice coupled by a Cavity Field
• Excitons and Cavity Polaritons for Optical Lattice Ultracold Atoms
• Coupling of Electronic and Motional Dynamics in a Cold Atom Optical Lattice
• Optical Properties of Collective Excitations for Finite Chains of Trapped Atoms
• Polarization-Mixing in Optical Lattices with Uniaxial Anisotropy
• Coupling of polaritons to vibrational modes of ultracold atoms in an optical lattice