Spontaneous Emission Near Superconducting Bodies

Abstract

In the present paper we study the spontaneous photon emission due to a magnetic spin-flip transition of a two-level atom in the vicinity of a dielectric body like a normal conducting metal or a superconductor. For temperatures below the transition temperature T_c of a superconductor, the corresponding spin-flip lifetime is boosted by several orders of magnitude as compared to the case of a normal conducting body. Numerical results of an exact formulation are also compared to a previously derived approximative analytical expression for the spin-flip lifetime and we find an excellent agreement. We present results on how the spin-flip lifetime depends on the temperature T of a superconducting body as well as its thickness H. Finally, we study how non-magnetic impurities as well as possible Eliashberg strong-coupling effects influence the spin-flip rate. It is found that non-magnetic impurities as well as strong-coupling effects have no dramatic impact on the spin-flip lifetime.

7 pages, 5 figures

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• Memory Effects in Spontaneous Emission Processes
• 3D modeling of magnetic atom traps on type-II superconductor chips
• Single vortex fluctuations in a superconducting chip as generating dephasing and spin flips in cold atom traps
• Trapping neutral atoms in the field of a vortex pinned by a superconducting nano-disc
• Novel approaches to tailor and tune light-matter interactions at the nanoscale