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Optics and Photonics News

Effect of tunneling resonances on the paramagnetism of an optical lattice

Georg A. Raithel, Boon-Keng Kevin Teo, Jeffrey R. Guest

Published Aug 1, 2001• 0 citations
OpenAlex

Abstract

We measure periodic modulations of the magnetization and the lifetime of atoms trapped in an optical lattice versus an applied B-field. The observations show that tunneling resonances can influence the macroscopic steady-state parameters in optical lattices.

Related papers

Effect of tunneling resonances on the paramagnetism of an optical lattice

Georg A. Raithel, Boon-Keng Kevin Teo, Jeffrey R. Guest

We measure periodic modulations of the magnetization and the lifetime of atoms trapped in an optical lattice versus an applied B-field. The observations show that tunneling resonances can influence the macroscopic steady-state parameters in optical lattices.

Quantum Electronics and Laser Science Conference•Nov 13, 2002•0 citations

Tunneling Resonances and Coherence in an Optical Lattice

Boon-Keng Kevin Teo, Jeffrey R. Guest, Georg A. Raithel

The center-of-mass quantization of atoms trapped in a gray optical lattice is observed to manifest itself in the steady-state properties of the atoms. Modulations in the lifetime and macroscopic magnetization as a function of an applied B field are attributed to quantum mechanical tunneling resonances and are shown to exist only under conditions which afford spatial coherence of the trapped atoms over several lattice wells and coherence times that exceed the tunneling period.

Physical Review Letters•Apr 10, 2002•8 citations

Magnetic behavior of atoms in gray optical lattices

Jeffrey R. Guest, Boon-Keng Kevin Teo, Natalya V. Morrow +1 more

The magnetization and lifetimes of atoms in gray optical lattices exhibit modulations as functions of an applied B field that are attributed to tunneling resonances between neighboring lattice wells. Expanding on previous observations, we show how these modulations depend on well depth, and we derive spin temperatures for the system. A band-structure-based model and quantum Monte Carlo wave-function simulations are used to explain these results. We predict subrecoil structures in the velocity distributions; these structures undergo systematic variations when the applied magnetic field is varied. Dramatically different behaviors for bosonic and fermionic spin systems are found and explained.

Journal of the Optical Society of America B•May 1, 2003•0 citations

Effects of static and random magnetic fields on atoms in a gray optical lattice

Natalya V. Morrow, S. K. Dutta, Georg A. Raithel

We study magnetic field-induced modifications of the well-to-well tunneling behavior of atoms in a one-dimensional grey optical lattice. Measurements of the tunneling frequency as a function of the applied magnetic field reveal several tunneling resonances. We further show that the tunneling signal can be suppressed by randomly varying the symmetry of the potential wells. The tunneling is suppressed most effectively if the autocorrelation time of the lattice-well variation is on the order of the tunneling time. Experimental and theoretical results are in good agreement.

Laser Physics•Jul 1, 2007•0 citations

Coherent quantum tunnelling and macroscopic superposition states in optical lattices

Ivan Deutsch, Poul Jessen

Summary form only given. The AC-Stark shift of a set of interfering laser beams together with the Zeeman interaction with external magnetic fields provide flexible mechanisms for coherently controlling atomic wave packets. When detuned far from atomic resonance, these optical lattices can trap cold atoms with minimal dissipation and thus provide an ideal environment for observing quantum coherent phenomena. We consider a one dimensional lattice of double wells produced by counterpropagating linearly polarized laser beams and a static magnetic field transverse to the laser wave vectors.

Conference on Lasers and Electro-Optics•Nov 27, 2002•0 citations

Resonantly Enhanced Tunneling of Bose-Einstein Condensates in Periodic Potentials

Carlo Sias, Alessandro Zenesini, Hans Lignier +4 more

We report on measurements of resonantly enhanced tunneling of Bose-Einstein condensates loaded into an optical lattice. By controlling the initial conditions of our system we were able to observe resonant tunneling in the ground and the first two excited states of the lattice wells. We also investigated the effect of the intrinsic nonlinearity of the condensate on the tunneling resonances.

arXiv:cond-mat/0702552•Physical Review Letters•Mar 23, 2007•105 citations
The magnetization and lifetimes of atoms in gray optical lattices exhibit modulations as functions of an applied B field that are attributed to tunneling resonances between neighboring lattice wells. Expanding on previous observations, we show how these modulations depend on well depth, and we derive spin temperatures for the system. A band-structure-based model and quantum Monte Carlo wave-function simulations are used to explain these results. We predict subrecoil structures in the velocity distributions; these structures undergo systematic variations when the applied magnetic field is varied. Dramatically different behaviors for bosonic and fermionic spin systems are found and explained.
We study magnetic field-induced modifications of the well-to-well tunneling behavior of atoms in a one-dimensional grey optical lattice. Measurements of the tunneling frequency as a function of the applied magnetic field reveal several tunneling resonances. We further show that the tunneling signal can be suppressed by randomly varying the symmetry of the potential wells. The tunneling is suppressed most effectively if the autocorrelation time of the lattice-well variation is on the order of the tunneling time. Experimental and theoretical results are in good agreement.
Summary form only given. The AC-Stark shift of a set of interfering laser beams together with the Zeeman interaction with external magnetic fields provide flexible mechanisms for coherently controlling atomic wave packets. When detuned far from atomic resonance, these optical lattices can trap cold atoms with minimal dissipation and thus provide an ideal environment for observing quantum coherent phenomena. We consider a one dimensional lattice of double wells produced by counterpropagating linearly polarized laser beams and a static magnetic field transverse to the laser wave vectors.