Azimuthal Sisyphus effect for atoms in a toroidal all-optical trap

Lembessis, V. E.; Ellinas, Demosthenes; Babiker, M.

doi:10.1103/physreva.84.043422

Cited by 15 publications

(14 citation statements)

References 16 publications

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“…More subtle quantum e↵ects due to the interaction of optical vortices with atoms and molecules involve internal atomic transitions at near resonance with the beam frequency. Here too, optical forces and torques are at play (Allen et al, 1996a;Andersen et al, 2006;Babiker et al, 1994;Lembessis et al, 2011;Surzhykov et al, 2015), leading to the trapping and manipulation of individual atoms in certain regions of the beam profile, with promising applications in the new field of atomtronics (Andersen et al, 2006;Lembessis and Babiker, 2013;Pepino et al, 2010;Seaman et al, 2007), as well as the proposed generation of atom vortex beams (Hayrapetyan et al, 2013;Lembessis et al, 2014). A related recent advance in matter vortex beams is the realisation of neutron vortex beams in the laboratory (Clark et al, 2015).…”

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confidence: 99%

Electron vortices: Beams with orbital angular momentum

et al. 2017

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The recent prediction and subsequent creation of electron vortex beams in a number of laboratories occurred after almost 20 years had elapsed since the recognition of the physical significance and potential for applications of the orbital angular momentum carried by optical vortex beams. A rapid growth in interest in electron vortex beams followed, with swift theoretical and experimental developments. Much of the rapid progress can be attributed in part to the clear similarities between electron optics and photonics arising from the functional equivalence between the Helmholtz equations governing the free space propagation of optical beams and the time-independent Schrödinger equation governing freely propagating electron vortex beams. There are, however, key di↵erences in the properties of the two kinds of vortex beams. This review is concerned primarily with the electron type, with specific emphasis on the distinguishing vortex features: notably the spin, electric charge, current and magnetic moment, the spatial distribution as well as the associated electric and magnetic fields. The physical consequences and potential applications of such properties are pointed out and analysed, including nanoparticle manipulation and the mechanisms of orbital angular momentum transfer in the electron vortex interaction with matter.

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confidence: 99%

Electron vortices: Beams with orbital angular momentum

et al. 2017

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“…The coherent superpositions of vortices of different circulation quantum numbers, especially vortex-antivortex cases [28,29], yield interesting interference effects with potential applications [30,31], such as manipulating the chirality of twisted metal nano-structures [32]. Creation of matter-wave vortex states from a non-rotating BEC by two-photon Raman transition method under paraxial LG and Gaussian (G) pulse is well discussed in literature [27,[33][34][35][36][37][38][39][40][41][42][43][44][45][46][47]. In these studies, matter-wave vortex is shown to acquire vorticity equal to the winding number of the LG beam.…”

Section: Creation Of Superposition Of Bec Vortex Statesmentioning

confidence: 99%

Interaction of atom with nonparaxial Laguerre-Gaussian beam: Forming superposition of vortex states in Bose-Einstein condensates

et al. 2016

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The exchange of orbital angular momentum (OAM) between paraxial optical vortex and a BoseEinstein condensate (BEC) of atomic gases is well known. In this paper, we develop a theory for the microscopic interaction between matter and an optical vortex beyond paraxial approximation.We show how superposition of vortex states of BEC can be created with a focused optical vortex.Since, the polarization or spin angular momentum (SAM) of the optical field is coupled with OAM of the field, in this case, these angular momenta can be transferred to the internal electronic and external center-of-mass (c.m.) motion of atoms provided both the motions are coupled. We propose a scheme for producing the superposition of matter-wave vortices using Gaussian and a focused Laguerre-Gaussian (LG) beam. We study how two-photon Rabi frequencies of stimulated Raman transitions vary with focusing angles for different combinations of OAM and SAM of optical states. We demonstrate the formation of vortex-antivortex structure and discuss interference of three vortex states in a BEC. * sonjoym@phy.iitkgp.ernet.in

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“…The most conducive way to prevent the loss of the particles from the trap is to incorporate toroidal optical traps [21], [22]. In such traps there will be no reflections because of the absence of any boundary and the particles following H + branch will always remain in this branch and we can realize the Landau physics for these neutral atoms.…”

Section: Realization Of the Landau Physics Of Neutral Atoms In Omentioning

confidence: 99%

Landau-like states in neutral particles

2016

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We show the emergence of a new type of dispersion relation for neutral atoms with an interesting similarity with the spectrum of 2-dimensional electrons in an applied perpendicular constant magnetic field. These neutral atoms can be confined in toroidal optical traps and give quasi Landau spectra. In strong contrast to the equi-distant infinitely degenerate Landau levels for charged particles, the spectral gap for such 2-dimensional neutral particles increases in particular electric field configurations. The idea in the paper is motivated by the development in cold atom experiments and builds on the seminal paper of Aharonov and Casher.

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Azimuthal Sisyphus effect for atoms in a toroidal all-optical trap

Cited by 15 publications

References 16 publications

Electron vortices: Beams with orbital angular momentum

Electron vortices: Beams with orbital angular momentum

Interaction of atom with nonparaxial Laguerre-Gaussian beam: Forming superposition of vortex states in Bose-Einstein condensates

Landau-like states in neutral particles

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