Atoms in a spin dependent optical potential: ground state topology and magnetization

Magnetization plateaus for spin-one bosons in optical lattices: Stern-Gerlach experiments with strongly correlated atoms.

We consider insulating states of spin-one bosons in optical lattices in the presence of a weak magnetic field. For the states with more than one atom per lattice site we find a series of quantum phase transitions between states with fixed magnetization and a canted nematic phase. In the presence of a global confining potential, this unusual phase diagram leads to several novel phenomena, includ...

Optical Method of Determining the Concentration of Atoms and Molecules in the Ground State

The phenomenon of anomalous dispersion has been used quite fruitfully by Rozhdestvensky and his pupils, who evolved the famous "rtacken-Methode." This method makes it possible to measure with great accuracy considerable optical densities, but involves quite formidable work on spectrograms. The theory of the 'Hacken-Methode" for determining the optical density of molecular substances has not yet...

Quantum optical spin-glass state of impurity two-level atoms in a photonic band gap.

We describe the collective optical properties of impurity two-level atoms in a photonic band gap interacting by resonance dipole-dipole interaction (RDDI) and coupled to a localized cavity mode. The random impurity atom positions are modeled by means of a Gaussian random distribution of RDDI’s with variance J and atomic line fluctuation with variance d. We demonstrate the occurrence of a new co...

Optical control of the spin state of two Mn atoms in a quantum dot

Transport of ground-state hydrogen atoms in a plasma expansion.

The transport of ground-state atomic hydrogen in the expansion of a thermal plasma generated from an Ar-H2 mixture is studied by means of laser-based diagnostic techniques. The flow of hydrogen atoms is investigated by two-photon excitation laser-induced fluorescence (LIF), whereas Ar atoms are probed by LIF as well as by UV Rayleigh scattering. The transport of Ar atoms can be fully understood...