C

Günther, Gitta; Huschke, Wolfram; Steiner, Walter

doi:10.1007/978-3-476-02958-4_3

Cited by 6 publications

(8 citation statements)

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“…The group of T. W. Hänsch and J. Reichel [75][76][77][78] realised a magnetic conveyor belt for moving atoms trapped in 3D across a chip over distances of many cm. A similar chip set up which demonstrated adiabatic transport of a 6 µK thermal cloud over several mm is reported in reference [79]. The group of R. J. C. Spreeuw [80] displaced atoms up to a round-trip distance of 360 µm, in a two-dimensional array of hundreds of tight traps generated by a permanently magnetised FePt film.…”

Section: Transport Experimentsmentioning

confidence: 88%

Experiments on a videotape atom chip: fragmentation and transport studies

Llorente-Garcia¹,

Darquié²,

Curtis³

et al. 2010

New J. Phys.

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This paper reports on experiments with ultra-cold rubidium atoms confined in microscopic magnetic traps created using a piece of periodically-magnetized videotape mounted on an atom chip. The roughness of the confining potential is studied with atomic clouds at temperatures of a few microKelvin and at distances between 30 µm and 80 µm from the videotape-chip surface. The inhomogeneities in the magnetic field created by the magnetized videotape close to the central region of the chip are characterized in this way. In addition, we demonstrate a novel transport mechanism whereby we convey cold atoms confined in arrays of videotape magnetic micro-traps over distances as large as ∼ 1 cm parallel to the chip surface. This conveying mechanism enables us to survey the surface of the chip and observe potential-roughness effects across different regions.

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Section: Transport Experimentsmentioning

confidence: 88%

Experiments on a videotape atom chip: fragmentation and transport studies

Llorente-Garcia¹,

Darquié²,

Curtis³

et al. 2010

New J. Phys.

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“…Additionally, high precision and high current coils can be made for precise generation of centimeter size magnetic fields. The DBC can also be patterned as a thermally conductive carrier for atom chips with finely patterned lithographic wires [6]. The ability to form vias in the DBC also allows for greater flexibility in chip designs and for the potential to make high power hermetic feedthroughs.…”

Section: Discussionmentioning

confidence: 99%

“…PACS numbers: 03.75.Be, 37.10.Gh, 41. 20.Gz Atom chips have been used in many cold atomic physics experiments including magneto-optical traps [1], magnetic traps [1,2], waveguides [3,4], transports [5,6], Bose-Einstein condensates [7], coherent and incoherent beam splitters [8][9][10], and have been integrated with optical elements [11][12][13]. Using atom chips for cold neutral atom physics has two main advantages.…”

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confidence: 99%

Atom chips on direct bonded copper substrates

Squires¹,

Stickney²,

Carlson³

et al. 2011

Review of Scientific Instruments

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We present the use of direct bonded copper (DBC) for the straightforward fabrication of high power atom chips. Atom chips using DBC have several benefits: excellent copper/substrate adhesion, high purity, thick (>100 μm) copper layers, high substrate thermal conductivity, high aspect ratio wires, the potential for rapid (<8 h) fabrication, and three-dimensional atom chip structures. Two mask options for DBC atom chip fabrication are presented, as well as two methods for etching wire patterns into the copper layer. A test chip, able to support 100 A of current for 2 s without failing, is used to determine the thermal impedance of the DBC. An assembly using two DBC atom chips is used to magnetically trap laser cooled (87)Rb atoms. The wire aspect ratio that optimizes the magnetic field gradient as a function of power dissipation is determined to be 0.84:1 (height:width).

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“…Atom chips [1,2] consisting of planar geometries of microfabricated wires or patterned magnetic materials provide intricate magnetic potentials and have become a practical and robust tool for producing, trapping and manipulating Bose-Einstein condensates. Atoms chips have recently been used to precisely position Bose-Einstein condensates [3], realize trapped atom interferometers [4,5] and have provided new and sensitive techniques for detecting tiny forces on a small spatial scale [6]. The fabricated wires or magnetic materials used for atom chips have been the topic of several recent studies, finding that their quality must be exceptionally high since even the smallest imperfections, for example roughness of the wire edge, can lead to uncontrolled magnetic field variations.…”

Section: Introductionmentioning

confidence: 99%

Scanning magnetoresistance microscopy of atom chips

Volk

Whitlock

Wolff

et al. 2008

Review of Scientific Instruments

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Surface based geometries of microfabricated wires or patterned magnetic films can be used to magnetically trap and manipulate ultracold neutral atoms or Bose-Einstein condensates. We investigate the magnetic properties of such atom chips using a scanning magnetoresistive (MR) microscope with high spatial resolution and high field sensitivity. By comparing MR scans of a permanent magnetic atom chip to field profiles obtained using ultracold atoms, we show that MR sensors are ideally suited to observe small variations of the magnetic field caused by imperfections in the wires or magnetic materials which ultimately lead to fragmentation of ultracold atom clouds. Measurements are also provided for the magnetic field produced by a thin current-carrying wire with small geometric modulations along the edge. Comparisons of our measurements with a full numeric calculation of the current flow in the wire and the subsequent magnetic field show excellent agreement. Our results highlight the use of scanning MR microscopy as a convenient and powerful technique for precisely characterizing the magnetic fields produced near the surface of atom chips.

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C

Cited by 6 publications

References 0 publications

Experiments on a videotape atom chip: fragmentation and transport studies

Experiments on a videotape atom chip: fragmentation and transport studies

Atom chips on direct bonded copper substrates

Scanning magnetoresistance microscopy of atom chips

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