Creation of matter wave Bessel beams and observation of quantized circulation in a Bose-Einstein condensate
TLDR
In this paper, a Bessel beam of de Broglie matter waves was created by the free evolution of a thin toroidal atomic Bose-Einstein condensate (BEC) which has been set into rotational motion.Abstract:
Bessel beams are plane waves with amplitude profiles described by Bessel functions. They are important because they propagate ‘diffraction-free’ and because they can carry orbital angular momentum. Here we report the creation of a Bessel beam of de Broglie matter waves. The Bessel beam is produced by the free evolution of a thin toroidal atomic Bose–Einstein condensate (BEC) which has been set into rotational motion. By attempting to stir it at different rotation rates, we show that the toroidal BEC can only be made to rotate at discrete, equally spaced frequencies, demonstrating that circulation is quantized in atomic BECs. The method used here can be viewed as a form of wavefunction engineering which might be developed to implement cold atom matter wave holography.read more
Citations
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Atoms in complex twisted light
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Conical refraction: fundamentals and applications
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Interferometric measurement of the current-phase relationship of a superfluid weak link
TL;DR: In this paper, the phase gradient around a ring-shaped superfluid Bose-Einstein condensate (BEC) containing a rotating weak link is measured to identify the current flowing around the ring.
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Coherent superposition of current flows in an atomtronic quantum interference device
Davit Aghamalyan,Marco Cominotti,Marco Cominotti,Matteo Rizzi,Davide Rossini,Frank W. J. Hekking,Frank W. J. Hekking,Anna Minguzzi,Anna Minguzzi,Leong Chuan Kwek,Leong Chuan Kwek,Luigi Amico +11 more
TL;DR: In this article, a correlated Bose gas tightly confined into a ring shaped lattice, in the presence of an artificial gauge potential inducing a persistent current through it, is considered, and a weak link painted on the ring acts as a source of coherent backscattering for the propagating gas, interfering with the forward scattered current.
References
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Bessel beams: Diffraction in a new light
David McGloin,Kishan Dholakia +1 more
TL;DR: In this article, the theoretical foundation of the Bessel beam is described and various experiments that make use of Bessel beams are discussed: these cover a wide range of fields including non-linear optics, where the intense central core of the bessel beam has attracted interest; short pulse non-diffracting fields; atom optics, and optical manipulation where the reconstruction properties of the beam enable new effects to be observed that cannot be seen with Gaussian beams.