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State-dependent potentials in a nanofiber-based two-color trap for cold atoms

Fam Le Kien, P. Schneeweiss, and A. Rauschenbeutel
Phys. Rev. A 88, 033840 – Published 24 September 2013

Abstract

We analyze the ac Stark shift of a cesium atom interacting with far-off-resonance guided light fields in the nanofiber-based two-color optical dipole trap realized by Vetsch et al. [Phys. Rev. Lett. 104, 203603 (2010)]. Particular emphasis is given to the fictitious magnetic field produced by the vector polarizability of the atom in conjunction with the ellipticity of the polarization of the trapping fields. Taking into account the ac Stark shift, the atomic hyperfine interaction, and a magnetic interaction, we solve the stationary Schrödinger equation at a fixed point in space and find Zeeman-state-dependent trapping potentials. In analogy to the dynamics in magnetic traps, a local degeneracy of these state-dependent trapping potentials can cause spin flips and should thus be avoided. We show that this is possible using an external magnetic field. Depending on the direction of this external magnetic field, the resulting trapping configuration can still exhibit state-dependent displacement of the potential minima. In this case, we find nonzero Franck-Condon factors between motional states of the potentials for different hyperfine-structure levels and propose the possibility of microwave cooling in a nanofiber-based two-color trap.

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  • Received 13 June 2013

DOI:https://doi.org/10.1103/PhysRevA.88.033840

©2013 American Physical Society

Authors & Affiliations

Fam Le Kien, P. Schneeweiss, and A. Rauschenbeutel

  • Vienna Center for Quantum Science and Technology, Institute of Atomic and Subatomic Physics, Vienna University of Technology, Stadionallee 2, 1020 Vienna, Austria

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Issue

Vol. 88, Iss. 3 — September 2013

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