Transition between ground state and metastable states in classical two-dimensional atoms

TIHE METASTABLE 2p3-STATE OF MfERCURY ATOMS

Photoquenching Indications of a Thermally Triggered Transition Between Two Different EL2 Metastable States in GaAs

In this work we report the observation of two different EL2 metastable states in GaAs and the effect of the optical/thermal history of the sample on the behavior of the photoquenching kinetics. In one thermal/optical preparation, the photoquenching curve presented two time constants that have already been interpreted as an indication of two different metastable states. With another preparation,...

Entanglement and factorized ground states in two-dimensional quantum antiferromagnets.

Making use of exact results and quantum Monte Carlo data for the entanglement of formation, we show that the ground state of anisotropic two-dimensional S=1/2 antiferromagnets in a uniform field takes the classical-like form of a product state for a particular value and orientation of the field, at which the purely quantum correlations due to entanglement disappear. Analytical expressions for t...

Multichannel cold collisions between metastable Sr atoms.

We present a multichannel-scattering calculation of elastic and inelastic cold collisions between two low-field seeking, metastable 88Sr [(5s5p)3P2] atoms in the presence of an external magnetic field. The scattering physics is governed by strong anisotropic long-range interactions, which lead to pronounced coupling among the partial waves of relative motion. As a result, nonadiabatic transitio...

Hyperfine quenching of the metastable P0,2 states in divalent atoms

Hyperfine quenching rates of the lowest-energy metastable P0 and P2 states of Mg, Ca, Sr, and Yb atoms are computed. The calculations are carried out using ab initio relativistic many-body methods. The computed lifetimes may be useful for designing novel ultraprecise optical clocks and trapping experiments with the P2 fermionic isotopes. The resulting natural widths of the P0 S0 clock transitio...