Atomic spin decoherence near conducting and superconducting films

S. Scheel, P. K. Rekdal, P. L. Knight, E. A. Hinds
2005 Physical Review A. Atomic, Molecular, and Optical Physics  
We derive scaling laws for the spin decoherence of neutral atoms trapped near conducting and superconducting plane surfaces. A new result for thin films sheds light on the measurement of Y.J. Lin, I. Teper, C. Chin, and V. Vuleti\'{c} [Phys. Rev. Lett. \textbf{92}, 050404 (2004)]. Our calculation is based on a quantum-theoretical treatment of electromagnetic radiation near metallic bodies [P.K. Rekdal, S. Scheel, P.L. Knight, and E.A. Hinds, Phys. Rev. A \textbf{70}, 013811 (2004)]. We show
more » ... 2004)]. We show that there is a critical atom-surface distance that maximizes the spin relaxation rate and we show how this depends on the skin depth and thickness of the metal surface. In the light of this impedance-matching effect we discuss the spin relaxation to be expected above a thin superconducting niobium layer.
doi:10.1103/physreva.72.042901 fatcat:epgbdowmnbhtjfkw3kgfbij3fq