Artikel,

Atomic spin decoherence near conducting and superconducting films

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Physical Review A (Atomic, Molecular, and Optical Physics), (2005)
DOI: 10.1103/physreva.72.042901

Zusammenfassung

We derive scaling laws for the spin decoherence of neutral atoms trapped near conducting and superconducting plane surfaces. A result for thin films sheds light on the measurement of Y. J. Lin, I. Teper, C. Chin, and V. Vuleti Phys. Rev. Lett. 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 70, 013811 (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.

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