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Physical Review A

Binding of neutral atoms to ferromagnetic wire

V. M. Tkachuk

Published Dec 1, 1999• 24 citations
Publisher

Abstract

We suggest a method of binding atoms to ferromagnetic wire through the interaction between the atomic magnetic moment and the magnetic field of the wire. It is shown that the two-dimensional $1/{\ensuremath{\rho}}^{2}$ potential arises between the atom and the wire with magnetization perpendicular to the latter, the three-dimensional ${1/r}^{2}$ potential arises between the atom and the end of the wire with magnetization parallel to the wire, the two-dimensional $1/\ensuremath{\rho}$ potential arises when magnetization of the wire is parallel to the wire, and the magnitude of magnetization changes linearly along the wire. We also discuss the possibility of experimental realization of binding of sodium atoms to the ferromagnetic iron wire.

DOI
10.1103/physreva.60.4715

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原子与分子物理学报•Jan 1, 2003•0 citations
We suggest a method of binding atoms to ferromagnetic wire through the interaction between the atomic magnetic moment and the magnetic field of the wire. It is shown that the two-dimensional 1/\ensuremathρ21/{\ensuremath{\rho}}^{2}1/\ensuremathρ2 potential arises between the atom and the wire with magnetization perpendicular to the latter, the three-dimensional 1/r2{1/r}^{2}1/r2 potential arises between the atom and the end of the wire with magnetization parallel to the wire, the two-dimensional 1/\ensuremathρ1/\ensuremath{\rho}1/\ensuremathρ potential arises when magnetization of the wire is parallel to the wire, and the magnitude of magnetization changes linearly along the wire. We also discuss the possibility of experimental realization of binding of sodium atoms to the ferromagnetic iron wire.
We suggest the binding of neutral atoms to a current carrying wire through the interaction between the atomic magnetic dipole moment and the wire's magnetic field. The theoretical description is based upon an extension of the concept of supersymmetry to multicomponent wave functions. A solution for spin 12\frac{1}{2}21​ particles is obtained directly in coordinate space. Spin 1 particles are considered as well. Experimentally, the system should be immediately realizable for 25 mK sodium atoms around a wire with a diameter of $0.5\ensuremath{\mu}\mathrm{m}$ and a current of 400 mA.
We demonstrate the guiding of neutral atoms with two parallel microfabricated current-carrying wires on the atom chip and a vertical magnetic bias field. The atoms are guided along a magnetic field minimum parallel to the current-carrying wires and confined in the other two directions. We describe in detail how the precooled atoms are efficiently loaded into the two-wire guide. We present a detailed experimental study of the motional properties of the atoms in the guide and the relationship between the location of the guide and the vertical bias field. This two-wire guide with vertical bias field can be used to realize large area atom interferometer.
The spectrum and the wave function of neutral atoms in the magnetic field of a Kepler-guide are presented by reducing a two-dimensional stationary Schrdinger equation to a one-dimensional hydrogen atom in Rydberg states. In addition, we set the scale for the atomic orbits and binding energy i n the quantum regime, and compare it with the outcome of the experiment. At the same time, we find that reducing the current and radius of the wire properly wil l increase the loading efficiency of the Kepler-guide.