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Chinese Journal of Quantum Electronics

Controllable cold atom beam splitter based on parallel current-carrying wires and bias magnetic field

Liu Nan-Chun

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

A novel controllable cold neutral atom guiding scheme based on parallel current-carrying wires and bias magnetic field is proposed.Magnetic field distribution in cross-section at different transverse bias field B_(bx) is calculated.The centre of magnetic traps is discussed.Single-channel and double-channel magnetic guiding can be realized.Based on this scheme,an atom beam splitter,which has adjustable splitting ratio, is designed by adding a longitudinal magnetic bias field B_(by).The transverse distribution of magnetic trap is calculated,and the magnetic contour plane of the splitter is shown.By using the classical Monte-Carlo method,the splitting process is simulated,and this scheme is validated by the simulation results.Splitting ratio between left and right guide changes from 0.9/0.1 to 0.1/0.9 when longitudinal magnetic bias field B_(by) changes from -0.005 G to 0.005 G.

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A novel controllable cold neutral atom guiding scheme based on parallel current-carrying wires and bias magnetic field is proposed.Magnetic field distribution in cross-section at different transverse bias field B_(bx) is calculated.The centre of magnetic traps is discussed.Single-channel and double-channel magnetic guiding can be realized.Based on this scheme,an atom beam splitter,which has adjustable splitting ratio, is designed by adding a longitudinal magnetic bias field B_(by).The transverse distribution of magnetic trap is calculated,and the magnetic contour plane of the splitter is shown.By using the classical Monte-Carlo method,the splitting process is simulated,and this scheme is validated by the simulation results.Splitting ratio between left and right guide changes from 0.9/0.1 to 0.1/0.9 when longitudinal magnetic bias field B_(by) changes from -0.005 G to 0.005 G.
We propose a new scheme to magnetically guide cold neutral atoms using a U-shaped current carrying conductor. The spatial magnetic field distribution from the U-shaped current-carrying conductor and the relationship between the magnetic field and parameters of the U-shaped conductor are analysed. Our study shows that U-shaped current-carrying conductor can be used to realize single- or double-channel magnetic guiding of cold atoms in weak-field-seeking states and to construct various atom-optical elements. By using Monte Carlo simulations, the dynamic process of the guided atomic-beam splitting in an atomic-beam splitter composed by the U-shaped current-carrying conductor is studied and some results are presented.
We propose a novel atomic beamsplitter for guided atoms composed of a U-shaped current carrying conductor and an additional bias magnetic field, and study the dynamic process of atomic beam splitting in the beamsplitter by Monte Carlo simulations. Our study shows that the splitting ratio of the beamsplitter can be continuously adjusted from 0 to 1 by changing the additional bias field. In addition, the transverse temperature of guided atoms at the outlets of the beamsplitter are also estimated and explained qualitatively.
A laser-cooled neutral-atom beam from a low-velocity intense source is split into two beams while it is guided by a magnetic-field potential. We generate our multimode beam-splitter potential with two current-carrying wires upon a glass substrate combined with an external transverse bias field. The atoms are guided around curves and a beam-splitter region within a 10-cm guide length. We achieve a maximum integrated flux of 1.5x10(5)atoms/s with a current density of 5x10(4)amp/cm (2) in the 100-microm -diameter wires. The initial beam can be split into two beams with a 50/50 splitting ratio.
Abstract We propose two novel schemes for guiding cold, neutral atoms using static magnetic fields generated by several cylindrical arrays of current‐carrying wires or a few different‐shaped (V‐, or U‐shaped, etc.) current‐carrying conductors, and calculate the corresponding magnetic‐field contours and their trapping potentials. Our study shows that some guiding schemes can be used to form an atomic funnel, or an atomic beam‐splitter, or even construct an atomic interferometer, and some guiding schemes can be used to realize a single‐mode wave guide of ultracold atoms (or coherent matter waves, BEC) under certain conditions. We also propose a few new schemes to microscopically trap neutral atoms by using various planar arrays of current‐carrying wires and calculate the spatial distribution of the magnetic fields. Our research shows that these microtrap arrays can be used to form 1D, 2D or 3D atomic magnetic lattices, and then to prepare 1D, 2D or 3D photonic crystals, even to realize a 1D, 2D or 3D array of magnetically‐trapped BECs or Bose Clusters.
We propose a novel controllable double-well magneto-optical trap (MOT) by using a square current-carrying wire and a bias magnetic field. The spatial distributions of the magnetic fields and their gradients are calculated, and the results show that the proposed trap has double magnetic wells with two centres of zero magnetic field and can be continuously evolved as a single-well trap by reducing the current in the wire or increasing the bias field, which can be used to realize a controllable double-well MOT, even to prepare one- and two-dimensional arrays of magneto-optical lattices on the surface of an atom chip. We also estimate the number (~107) and temperature (~260 μK) of trapped cold atoms in our MOT.
We propose a beam splitter for cold polar molecules in weak-field-seeking states that uses a Y-shaped charged wire half embedded in a substrate and sandwiched by a charged metallic parallel-plate capacitor. We demonstrate our molecular-beam splitter and study its dynamic beam-splitting process for the guided cold molecules by using Monte Carlo simulation. Our study shows that cold polar molecules from a supersonic beam source with a mean velocity of a few hundred meters per second can be split with a fixed 0.5/0.5 splitting ratio, and an adjustable splitting ratio of about 0.03-0.97 can be realized by introducing a small alteration to the scheme.