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Conference on Lasers and Electro-Optics

Atomic transport in integrated magnetic microtraps

W. Hänsel, J. Reischel, P. Hommerhoff, Theodor W. Hänsch

Published Aug 29, 2005• 0 citations
Publisher

Abstract

Summary form only given. Magnetic microtraps with current-carrying wires have initially been proposed in order to reach field configurations with high gradients. In our first demonstration of an electromagnetic microtrap, we used a lithography created wire on a substrate at room temperature to realize a quadrupole trap. Transverse gradients of 1600 G/cm were achieved with only 2A of current flowing, through the wire. More recently, we have extended this technique in Ioffe traps, which are more suitable for achieving long lifetimes at low temperatures. A moving chain of Ioffe-Pritchard traps can be created with a simple planar wire configuration. We present experimental results with this atom motor.

DOI
10.1109/iqec.2000.908137

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Summary form only given. Magnetic microtraps with current-carrying wires have initially been proposed in order to reach field configurations with high gradients. In our first demonstration of an electromagnetic microtrap, we used a lithography created wire on a substrate at room temperature to realize a quadrupole trap. Transverse gradients of 1600 G/cm were achieved with only 2A of current flowing, through the wire. More recently, we have extended this technique in Ioffe traps, which are more suitable for achieving long lifetimes at low temperatures. A moving chain of Ioffe-Pritchard traps can be created with a simple planar wire configuration. We present experimental results with this atom motor.
Abstract Ultracold atoms created using microtraps are being used in an increasing number of diverse applications. This paper reviews the double-loop microtrap which consists of two concentric circular wire loops carrying oppositely oriented currents. This generates a magnetic field configuration that traps a magnetic dipole in three-dimensions. The position of the trapped atoms relative to the atom chip surface containing the microwire loops, can be precisely controlled by applying different currents in the two loops or alternatively using a so called bias magnetic field oriented perpendicular to the chip surface. Double-loop microtraps can be daisy chained in series to create a one- or two-dimensional microtrap array. Experiments that have demonstrated a double-loop microtrap array are discussed. Future possibilities are presented as to how atoms can be transferred between adjacent microtraps as well as the use of an additional micro sized Ioffe coil to create a trap having a nonzero magnetic field minimum to reduce atom loss by suppressing Majorana transitions.
We propose a novel array of controllable double-well magnetic microtraps for cold atoms by using an array of square current-carrying wires and two additional bias magnetic fields. Arrays of double layer magnetooptical traps (MOTs) and Ioffe traps can be constructed by using same wire configurations and different currents and bias fields. Furthermore, the array of double-well magnetic microtraps can be continuously evolved as an array of single-well magnetic microtraps by reducing the currents in the wires. Our study shows that our scheme can be used to realize a controllable double-layer magnetic lattice with cold atoms, to form array of Bose-Einstein condensations (BECs), or to study atom interference, and so on.
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A single microscopic magnetic trap for neutral atoms using planar current-carrying wires was proposed and studied theoretically by Weinstein et al.In this paper,we propose three structures of composite current-carrying wires to provide 1D,2D and 3D arrays of microscopic magnetic traps for cold alkali atoms.The spatial distributions of magnetic fields generated by these structures are calculated and the field gradient and curvature in each single microtrap are analysed.Our study shows that arrays of microscopic magnetic traps can be used to provide 1D,2D or 3D atomic magnetic lattices,and even to realize 1D,2D and 3D arrays of magneto-optical traps,and so on.
Micro-electromagnets for atom manipulation have been constructed, including magnetic mirrors (serpentine patterns) and traps (circular patterns). They consist of planar micron-scale Au wires on sapphire substrates fabricated using lithography and electroplating. At liquid nitrogen or helium temperatures in vacuum the wires support currents of several amperes with current density ∼108 A/cm2 and power dissipation ∼10 kW/cm2, and they produce magnetic fields to 0.3 T and gradients to 103 T/cm. The micro-electromagnet mirror was used to deflect a beam of metastable helium atoms at grazing angles ∼0.5 mrad.