Quantum Phases of Ultracold Bosonic Atoms in two Bands of an Optical-Lattice coupled by a Cavity Field
arXiv:0902.2638 · doi:10.1103/PhysRevA.80.053608
Abstract
We study the quantum phase transitions between superfluid and Mott insulator states for ultracold bosons occupying two bands of an optical lattice. The two atomic states are resonantly coupled by a single cavity mode which mediates transitions between the two bosonic particle modes via absorption or emission of a cavity photon. This coupling between the bands shifts the appearance of the Mott insulator phase towards deeper optical lattice potentials and stronger on-site interaction strength, as atomic coherence can build up via photon assisted tunneling in both bands. Varying the intra and interband on-site interactions leads to several different atomic phase configurations. There are even parameter regions where a mean field approach predicts concurrence of a Mott insulator state in one band, while atoms in the second band stay superfluid.
12 pages, 18 figures
References in corpus (17)
- 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
- Strong atom-field coupling for Bose-Einstein condensates in an optical cavity on a chip
- Cavity QED with a Bose-Einstein condensate
- Strong magnetic coupling of an ultracold gas to a superconducting waveguide cavity
- Cavity-enhanced superradiant Rayleigh scattering with ultra-cold and Bose-Einstein condensed atoms
- Microscopic physics of quantum self-organisation of optical lattices in cavities
- Polaritons and Pairing Phenomena in Bose--Hubbard Mixtures
- Excitons and cavity polaritons for ultracold atoms in an optical lattice
- Bright and dark excitons in an atom--pair filled optical lattice within a cavity
- Superradiant and Dark Exciton States in an Optical Lattice within a Cavity
- Exciton-Polariton scattering for defect detection in cold atom Optical Lattices
- Light propagation in atomic Mott Insulators
- Coupling of Electronic and Motional Dynamics in a Cold Atom Optical Lattice
- Polarization-Mixing in Optical Lattices with Uniaxial Anisotropy
- Twin stimulated amplification of light and matter waves in an atom-photon pair laser