High-precision laser spectroscopy of cold atoms and the search for the drift of the fine structure constant

Abstract

We consider the critical behaviour of binary mixtures described by the ϕ 4 Landau-Ginzburg free energy and subject to an external shear flow. The critical temperature is calculated as a function of the shear rate γ in the limit of an infinite number of components of the field. The two cases with conserved and non-conserved order parameter are analysed. The values of the critical temperature depend on the dynamics considered. In particular, at small γ , the critical temperature grows as γ 1/4 in the conserved case and as γ 1/2 in the non-conserved case.

Inner-shell clock transition in atomic thulium with a small blackbody radiation shift

“…This approach combines advantages of unprecedented frequency stability of optical lattice clocks on neutral atoms and low sensitivity to BBR of ion optical clocks. Moreover, precision spectroscopy in Tm opens possibilities for sensitive tests of Lorentz invariance 5 and for a search of the fine structure constant variation 41 .…”