Perspectives of ultracold atoms trapped in magnetic micro potentials

Fortágh, József; Kraft, Sebastian; Günther, Andreas; Trück, Christian; Wicke, P.; Zimmermann, C.

doi:10.1016/j.optcom.2004.06.072

Cited by 12 publications

(7 citation statements)

References 40 publications

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“…Thus, a second uniform offset magnetic field B o parallel to the wire is superimposed to the trapping field to ensure that the adiabaticity condition remains satisfied in the trap. The trapping in the transverse direction is then harmonic (Folman et al, 2002;Fortagh et al, 2004). With a Zshaped wire, the atoms can also be confined along the central part of the wire by a shallow harmonic confining potential.…”

Section: Trapped Atomsmentioning

confidence: 99%

One dimensional bosons: From condensed matter systems to ultracold gases

et al. 2011

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The physics of one-dimensional interacting bosonic systems is reviewed. Beginning with results from exactly solvable models and computational approaches, the concept of bosonic Tomonaga-Luttinger liquids relevant for one-dimensional Bose fluids is introduced, and compared with Bose-Einstein condensates existing in dimensions higher than one. The effects of various perturbations on the Tomonaga-Luttinger liquid state are discussed as well as extensions to multicomponent and out of equilibrium situations. Finally, the experimental systems that can be described in terms of models of interacting bosons in one dimension are discussed

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Section: Trapped Atomsmentioning

confidence: 99%

One dimensional bosons: From condensed matter systems to ultracold gases

et al. 2011

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“…The development of atom chips for cold atoms [1,28] and BEC [29] opened up possibilities for integration [30], complex geometries, and miniaturization. However, while coherent beamsplitters for stationary BECs have been realized on atom chips [31], to date all propagation on atom chips has been restricted to linear guides [32][33][34]. The optical dipole force of laser light propagating inside a hollow-core optical fiber was used in the first demonstration of atom guiding [35].…”

Section: Introductionmentioning

confidence: 99%

Integrated coherent matter wave circuits

Ryu

Boshier

2015

New J. Phys.

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An integrated coherent matter wave circuit is a single device, analogous to an integrated optical circuit, in which coherent de Broglie waves are created and then launched into waveguides where they can be switched, divided, recombined, and detected as they propagate. Applications of such circuits include guided atom interferometers, atomtronic circuits, and precisely controlled delivery of atoms. Here we report experiments demonstrating integrated circuits for guided coherent matter waves. The circuit elements are created with the painted potential technique, a form of time-averaged optical dipole potential in which a rapidly moving, tightly focused laser beam exerts forces on atoms through their electric polarizability. The source of coherent matter waves is a Bose-Einstein condensate (BEC). We launch BECs into painted waveguides that guide them around bends and form switches, phase coherent beamsplitters, and closed circuits. These are the basic elements that are needed to engineer arbitrarily complex matter wave circuitry.

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“…On the other hand a rapid advance in trapping techniques for ultracold gases has put these systems within experimental reach. In particular optical lattices [4], optical dipole traps [5], and atom chips [6] have recently been used to realize such low-dimensional systems. For further experiments under these conditions a good understanding of the transition between the 3D and the 1D regime is therefore of crucial importance.…”

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Collective excitation of Bose-Einstein condensates in the transition region between three and one dimensions

et al. 2005

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We measure the frequency of the low m=0 quadrupolar excitation mode of weakly interacting Bose-Einstein condensates in the transition region from the 3D to the 1D mean-field regime. Various effects shifting the frequency of the mode are discussed. In particular we take the dynamic coupling of the condensate with the thermal component at finite temperature into account using a timedependent Hartree-Fock-Bogoliubov treatment developed in [1]. We show that the frequency rises in the transition from 3D to 1D, in good agreement with the theoretical prediction [2].PACS numbers: 03.75. Kk, 03.75.Nt, 39.25.+k One-dimensional (1D) quantum degenerate Bose gases have recently attracted considerable theoretical and experimental interest [3]. On the one hand this interest is due to their remarkable physical properties which are absent in three-dimensional systems. On the other hand a rapid advance in trapping techniques for ultracold gases has put these systems within experimental reach. In particular optical lattices [4], optical dipole traps [5], and atom chips [6] have recently been used to realize such low-dimensional systems. For further experiments under these conditions a good understanding of the transition between the 3D and the 1D regime is therefore of crucial importance. In this paper this transition region is characterized experimentally by monitoring the oscillation of a quantum degenerate Bose gas.From a fundamental point of view, one of the most striking features of 1D quantum degenerate Bose gases is the predominant role played by quantum fluctuations. For spatially homogeneous 1D systems, fluctuations of the phase rule out the existence of any off-diagonal longrange order (ODLRO) [7] even at temperature T = 0 [8]. The finite size of trapped 1D gases however allows for a rich variety of possible scenarios, including true phase-coherent Bose-Einstein condensates (BECs) as well as phase-fluctuating BECs, the so-called quasicondensates [9].The behavior of these 1D Bose gases is governed by the ratio of interaction and kinetic energywhere n 1D is the 1D atomic density, m the atomic mass and g 1D the 1D coupling constant. Since this ratio scales as 1/n these gases counter-intuitively become more nonideal when the density is decreased. The fascinating features of these systems have led to continued theoretical interest over the past decades. For homogeneous 1D Bose gases with short-range interactions, the ground state [10], excitation spectrum [11] and thermodynamic properties [12] of the system can be determined with a Bethe Ansatz for arbitrary values of γ. In the case of trapped systems the equation of state can be found by combining this approach with the local density approximation [13]. For high densities the system is in the weakly interacting regime, where it can be well described in the frame of mean-field theories and ODLRO is present. On the contrary, for low densities the system enters the strongly interacting or strongly correlated regime, where a description by mean-field theories fails and ODLRO ...

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Perspectives of ultracold atoms trapped in magnetic micro potentials

Cited by 12 publications

References 40 publications

One dimensional bosons: From condensed matter systems to ultracold gases

One dimensional bosons: From condensed matter systems to ultracold gases

Integrated coherent matter wave circuits

Collective excitation of Bose-Einstein condensates in the transition region between three and one dimensions

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