Manipulation of cold atoms by an adaptable magnetic reflector

Rosenbusch, P.; Hall, Budd L.; Hughes, Ifan G.; Saba, C. V.; Hinds, E. A.

doi:10.1007/s003400050885

Cited by 22 publications

(17 citation statements)

References 2 publications

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“…This configuration, involving a single bias field, may be used as a spatial diffraction grating for slowly moving atoms [17,18,19,20], but is not useful as a magnetic lattice for ultracold atoms because of the zero potential minima. Table 1.…”

Section: Single Bias Fieldmentioning

confidence: 99%

“…This configuration may be used as a spatial diffraction grating [17,18,19,20] for slowly moving atoms. Figure 3 shows a numerical calculation of the magnetic field versus distance in the x-, y-and z-directions of a finite array consisting of two crossed layers of periodic arrays of parallel rectangular magnets.…”

Section: Single Finite Periodic Array Of Magnets With Bias Fieldsmentioning

confidence: 99%

See 1 more Smart Citation

Permanent magnetic lattices for ultracold atoms and quantum degenerate gases

Ghanbari¹,

Kieu²,

Sidorov³

et al. 2006

J. Phys. B: At. Mol. Opt. Phys.

122

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Abstract. We propose the use of periodic arrays of permanent magnetic films for producing magnetic lattices of microtraps for confining, manipulating and controlling small clouds of ultracold atoms and quantum degenerate gases. Using analytical expressions and numerical calculations we show that periodic arrays of magnetic films can produce one-dimensional (1D) and two-dimensional (2D) magnetic lattices with non-zero potential minima, allowing ultracold atoms to be trapped without losses due to spin flips. In particular, we show that two crossed layers of periodic arrays of parallel rectangular magnets plus bias fields, or a single layer of periodic arrays of square-shaped magnets with three different thicknesses plus bias fields, can produce 2D magnetic lattices of microtraps having nonzero potential minima and controllable trap depth. For arrays with micron-scale periodicity, the magnetic microtraps can have very large trap depths (∼0.5 mK for the realistic parameters chosen for the 2D lattice) and very tight confinement.

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Section: Single Bias Fieldmentioning

confidence: 99%

Section: Single Finite Periodic Array Of Magnets With Bias Fieldsmentioning

confidence: 99%

Permanent magnetic lattices for ultracold atoms and quantum degenerate gases

Ghanbari¹,

Kieu²,

Sidorov³

et al. 2006

J. Phys. B: At. Mol. Opt. Phys.

122

View full text Add to dashboard Cite

show abstract

“…These include audiotape [1], floppy disks [2,3,4], videotape [5,6], magneto-optical films [7,8,9], and hard disks [10]. Using standard lithographic techniques, it is also possible to make small patterns of current carrying wires for the same purpose [11,12].…”

Section: Introductionmentioning

confidence: 99%

Cold atoms in videotape micro-traps

Sinclair¹,

Retter²,

Curtis³

et al. 2005

Eur. Phys. J. D

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We describe an array of microscopic atom traps formed by a pattern of magnetisation on a piece of videotape. We describe the way in which cold atoms are loaded into one of these micro-traps and how the trapped atom cloud is used to explore the properties of the trap. Evaporative cooling in the micro-trap down to a temperature of 1 µK allows us to probe the smoothness of the trapping potential and reveals some inhomogeneity produced by the magnetic film. We discuss future prospects for atom chips based on microscopic permanent-magnet structures.

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“…Previous experiments on the transverse velocity distribution of atoms bouncing elastically on corrugated mirrors [9,10] also allow an interpretation in terms of caustics. However, those were of the usual deterministic kind, where the outgoing transverse velocity is a deterministic function of the position where the atom hits the mirror.…”

mentioning

confidence: 99%

Stochastic rainbow caustic observed with cold atoms

Wolschrijn¹,

Voigt²,

Jansen³

et al. 2001

Phys. Rev. A

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We report the direct observation of a novel type of rainbow caustic. In contrast to known examples, this caustic originates from a dissipative, stochastic process. We have observed this using cold 87 Rb atoms bouncing inelastically on an evanescent-wave atom mirror. The caustic appears as a sharp peak at the lower edge of the asymmetric velocity distribution of the bouncing atoms. The stochastic process is a spontaneous Raman transition due to photon scattering during the bounce. The results are in good agreement with a classical calculation.32.80. Lg, 42.50.Vk, Caustics are ubiquitous phenomena in nature. Examples are the cusp-shaped patterns of light reflection on the inside of a coffee-cup and the patterns of bright lines observed on the bottom of a swimming pool [1]. The prime example of a caustic is the common rainbow, which can be understood in a ray-optics picture by considering how the scattering angle of a light ray depends on its impact parameter on a water droplet [2] . Whereas the incident rays have smoothly distributed impact parameters, the outgoing rays pile up where the scattering angle has a local extremum. Such a divergence of the ray density, the caustic, appears at the rainbow angle. In atomic [3] and nuclear [4] scattering experiments analogous rainbow phenomena have also been observed.The examples of caustics that have been known so far have in common that the outgoing parameter (scattering angle) is a deterministic function of the incoming parameter (impact parameter). In this Letter we report on our observation of a new type of rainbow caustic existing by virtue of a stochastic process, which distributes a singlevalued "impact parameter" over a range of "scattering angles". To our knowledge, such stochastic caustics have not been observed before.We have observed this caustic in the vertical velocity distribution of cold atoms, after bouncing inelastically off an evanescent-wave mirror [5][6][7][8]. Previous experiments on the transverse velocity distribution of atoms bouncing elastically on corrugated mirrors [9,10] also allow an interpretation in terms of caustics. However, those were of the usual deterministic kind, where the outgoing transverse velocity is a deterministic function of the position where the atom hits the mirror. The caustic then originates from atoms reflecting from inflection points on the mirror surface.Whereas other experiments on inelastically bouncing atoms concentrated on the cooling properties, the appearence of the velocity caustic seems to have escaped attention. The incident atoms in our experiment are nearly monochromatic, i.e. they have a narrow velocity distribution ∆v/v = 0.03. During the bounce the atoms are optically pumped to a different hyperfine groundstate, by a spontaneous Raman transition. They leave the surface with less kinetic energy, due to the difference in optical potential. The outgoing atoms have a broad velocity distribution. This is due to the stochastic nature of the spontaneous Raman process, so that atoms make the transition at differe...

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Manipulation of cold atoms by an adaptable magnetic reflector

Cited by 22 publications

References 2 publications

Permanent magnetic lattices for ultracold atoms and quantum degenerate gases

Permanent magnetic lattices for ultracold atoms and quantum degenerate gases

Cold atoms in videotape micro-traps

Stochastic rainbow caustic observed with cold atoms

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