Roadmap on Atomtronics: State of the art and perspective

Amico, Luigi; Boshier, Malcolm; Birkl, G.; Minguzzi, Anna; Miniatura, Christian; Kwek, Leong‐Chuan; Aghamalyan, Davit; Ahufinger, V.; Anderson, Dana Z.; Andrei, Natan; Arnold, Aidan S.; Baker, Mark; Bell, T.A.; Bland, Thomas; Brantut, Jean-Philippe; Cassettari, Donatella; Chetcuti, Wayne Jordan; Chevy, Frédéric; Citro, Roberta; Palo, S. De; Dumke, Rainer; Edwards, Mark; Folman, R.; Fortágh, József; Gardiner, S. A.; Garraway, Barry M.; Gauthier, Gabriel M.; Günther, Andreas; Haug, Tobias; Hufnagel, Christoph; Keil, Mark; Klitzing, Wolf von; Ireland, P. J.; Lebrat, Martin; W.Li,; Longchambon, Laurent; Mompart, Josep Lluís Gómez; Morsch, O.; Naldesi, Piero; Neely, Tyler W.; Olshanii, Maxim; Orignac, Edmond; Saurabh, Pandey; Pérez-Obiol, Axel; Perrin, Hélène; Piroli, Lorenzo; Polo, J.; Pritchard, A. L.; Proukakis, N. P.; Rylands, Colin; Rubinsztein‐Dunlop, Halina; Scazza, Francesco; Stringari, S.; Tosto, Francesca; Trombettoni, Andrea; Victorin, Nicolas; Wilkowski, David; Xhani, Klejdja; Yakimenko, A. I.

doi:10.48550/arxiv.2008.04439

Cited by 15 publications

(21 citation statements)

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“…Much interest has been devoted in recent years to Bose-Einstein condensates confined by toroidal traps radially crossed by a number of rotating barriers, as such configurations present the clear potential of becoming central building blocks for the future atomtronic devices [1]. In case of a single rotating barrier, which yields the cold atom analogue of the celebrated rf-SQUID (radio frequency-Superconducting Quantum Interference Device)-a superconducting ring interrupted by a Josephson junction [2], well-defined phase slips between quantized persistent currents have been observed [3], along with a quantized hysteresis behavior [4].…”

Section: Introductionmentioning

confidence: 99%

“…The case of two diametrically disposed barriers corresponds to the cold atom version of the dc-SQUID [2], perhaps the most sensitive detector for magnetic flux available today. We may denote such atomtronic counterparts of SQUIDs as AQUIDs, for Atomtronic Quantum Interference Devices [1]. In a SQUID, a current flow is established by changing the magnetic flux through the loop, whereas the same effect in an AQUID is obtained as a consequence of the barrier rotation, or, equivalently, by imparting a geometric phase directly to the atoms via suitably designed laser fields [5].…”

Section: Introductionmentioning

confidence: 99%

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Rotation-driven transition into coexistent Josephson modes in an atomtronic dc-SQUID

Jezek,

Cataldo

2021

Preprint

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By means of a two-mode model, we show that transitions to different arrays of coexistent regimes in the phase space can be attained by rotating a double-well system, which consists of a toroidal condensate with two diametrically placed barriers. Such a configuration corresponds to the atomtronic counterpart of the well-known direct-current superconducting quantum interference device. Due to the phase gradient experimented by the on-site localized functions when the system is subject to rotation, a phase difference appears on each junction in order to satisfy the quantization of the velocity field around the torus. We demonstrate that such a phase can produce a significant change on the relative values of different types of hopping parameters. In particular, we show that within a determined rotation frequency interval, a hopping parameter, usually disregarded in nonrotating systems, turns out to rule the dynamics. At the limits of such a frequency interval, bifurcations of the stationary points occur, which substantially change the phase space portrait that describes the orbits of the macroscopic canonical conjugate variables. We analyze the emerging dynamics that combines the 0 and π Josephson modes, and evaluate the small-oscillation time-periods of such orbits at the frequency range where each mode survives. All the findings predicted by the model are confirmed by Gross-Pitaevskii simulations.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rotation-driven transition into coexistent Josephson modes in an atomtronic dc-SQUID

Jezek,

Cataldo

2021

Preprint

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“…Lately, laser light combined with spatial light modulators is also emerging as a new avenue for the production of arbitrary and even time varying potentials [14][15][16][17], including non-trivial phase engineering of Bose-Einstein condensates [18] and applications in atomtronics [19,20]. While the coherence of laser light is a key feature for the vast majority of the applications discussed, it could represent a hindrance in the generation of complex patterns using digital micromirror devices (DMDs).…”

Section: Introductionmentioning

confidence: 99%

Generation of optical potentials for ultracold atoms using a superluminescent diode

Smith,

Easton,

Guarrera

et al. 2021

Preprint

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We report on the realization and characterisation of optical potentials for ultracold atoms using a superluminescent diode. The light emitted by this class of diodes is characterised by high spatial coherence but low temporal coherence. On the one hand, this implies that it follows Gaussian propagation similar to lasers, allowing for high intensities and well-collimated beams. On the other, it significantly reduces those interference effects that lead to severe distortions in imaging. By using a high-resolution optical setup, we produce patterned optical potentials with a digital micromirror device and demonstrate that the quality of the patterns produced by our superluminescent diode is consistently and substantially higher than those produced by our laser. We show that the resulting optical potentials can be used to arrange the atoms in arbitrary structures and manipulate them dynamically. Our results can open new opportunities in the fields of quantum simulations and atomtronics.

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“…When it comes to a purely fundamental physics point of view, one may take advantage of controllable artificial systems to deepen understanding of quantum transport. Ultracold atomic gases are one of such systems [5], and now allow to realize typical quantum transport systems such as the tunneling junction [6][7][8] and mesoscopic systems [9,10]. An interesting perspective in transport research with ultracold atomic gases is to explore regimes hard to attain with solid-state materials.…”

Section: Introductionmentioning

confidence: 99%

Tunneling Hamiltonian analysis of DC Josephson currents in a weakly-interacting Bose-Einstein condensate

Uchino

2021

Preprint

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Atomtronics experiments with ultracold atomic gases allow us to explore quantum transport phenomena of a weakly-interacting Bose-Einstein condensate (BEC). Here, we focus on two-terminal transport of such a BEC in the vicinity of zero temperature. By using the tunnel Hamiltonian and Bogoliubov theory, we obtain a DC Josephson current expression in the BEC and apply it to experimentally relevant situations such as quantum point contact and planar junction. Due to the absence of Andreev bound states but the presence of couplings associated with condensation elements, a current-phase relation in the BEC is found to be different from one in an s-wave superconductor.

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Roadmap on Atomtronics: State of the art and perspective

Cited by 15 publications

References 0 publications

Rotation-driven transition into coexistent Josephson modes in an atomtronic dc-SQUID

Rotation-driven transition into coexistent Josephson modes in an atomtronic dc-SQUID

Generation of optical potentials for ultracold atoms using a superluminescent diode

Tunneling Hamiltonian analysis of DC Josephson currents in a weakly-interacting Bose-Einstein condensate

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