We analyze doubly magic trapping of Cs hyperfine transitions including previously neglected contributions from the ground state hyperpolarizability and the interaction of the laser light and a static magnetic field. Extensive numerical searches do not reveal any doubly magic trapping conditions for any pair of hyperfine states. However, including the hyperpolarizability reveals light intensity ...

We have observed microsecond spin-flip times in lightly doped n-GaAs, by measuring the photoluminescence polarization in the time domain with pump and probe pulses. Times up to 1.4 ms have been measured. Our results as a function of magnetic field indicate three regions governing the spin relaxation: a low field region, where spin-flip times increase due to suppression of the nuclear hyperfine ...

The ground state hyperfine splitting values of high Z hydrogenlike ions are calculated. The relativistic, nuclear and QED corrections are taken into account. The nuclear magnetization distribution correction (the Bohr-Weisskopf effect) is evaluated within the single particle model with the g S-factor chosen to yield the observed nuclear moment. An additional contribution caused by the nuclear s...

The Mossbauer effect in the 100-keV 2+ ~ 0+ transition in W182 was observed with dilute t~ngsten in iron alloy absorbers with concentrations from 0.5-5.0 at.%W at 4.2°K. From the Zeeman spectra In external longitudinal magnetic fields, the g factor of the first excited 2+ state was found to be O.~2±0.O~, and the hyperfine field at tungsten nuclei in iron was found to be -708±25 kOe. The hyperfi...

In this article we analyze spin dynamics for electrons confined to semiconductor quantum dots due to the contact hyperfine interaction. We compare mean-field classical evolution of an electron spin in the presence of a nuclear field with the exact quantum evolution for the special case of uniform hyperfine coupling constants. We find that in this special case the zero-magnetic-field dynamics du...