Vortex excitation in a stirred toroidal Bose-Einstein condensate

Yakimenko, A. I.; Isaieva, Karyna; Vilchinskiĭ, S. I.; Ostrovskaya, Elena A.

doi:10.1103/physreva.91.023607

Cited by 28 publications

(24 citation statements)

References 38 publications

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“…These solutions form a manifold of discrete phonon-like modes that propagate azimuthally with the characteristic speed of sound of the ring condensate c gn M. 1 0 ( ) = Figure 3 shows the calculated the energy spectrum of elementary excitations by solving the BdG equations. Our results exhibit some similarities to those reported for two-dimensional gases confined in toroidal traps [35,54]. For small m, the modes for the lowest branch are nodeless in the radial and axial (z) directions [10].…”

Section: Bdg Desciption Of Elementary Excitations Of a Becsupporting

confidence: 87%

Resonant wavepackets and shock waves in an atomtronic SQUID

et al. 2015

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The fundamental dynamics of ultracold atomtronic devices are reflected in their phonon modes of excitation. We probe such a spectrum by applying a harmonically driven potential barrier to a 23 Na Bose-Einstein condensate in a ring-shaped trap. This perturbation excites phonon wavepackets. When excited resonantly, these wavepackets display a regular periodic structure. The resonant frequencies depend upon the particular configuration of the barrier, but are commensurate with the orbital frequency of a Bogoliubov sound wave traveling around the ring. Energy transfer to the condensate over many cycles of the periodic wavepacket motion causes enhanced atom loss from the trap at resonant frequencies. Solutions of the time-dependent Gross-Pitaevskii equation exhibit quantitative agreement with the experimental data. We also observe the generation of supersonic shock waves under conditions of strong excitation, and collisions of two shock wavepackets. OPEN ACCESS RECEIVED

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Section: Bdg Desciption Of Elementary Excitations Of a Becsupporting

confidence: 87%

Resonant wavepackets and shock waves in an atomtronic SQUID

et al. 2015

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“…As was shown in Ref. [19], a small stirrer at low rotation rate excites vortex-antivortex pairs near the center of the rotating barrier in the bulk of the condensate. Then the pair undergoes a breakdown and the antivortex moves spirally to the external surface of the condensate and finally decays into elementary excitations, while the vortex becomes pinned in the central hole of the annulus, adding one unit to the topological charge of the persistent current.…”

Section: A Slowly Rotating Weak Linksupporting

confidence: 53%

“…In our recent work [19] using a 2D dissipative mean-field model, we have investigated the mechanism of the persistent current generation for the experimental parameters used in Ref. [18].…”

Section: Introductionmentioning

confidence: 99%

Vortices in a toroidal Bose-Einstein condensate with a rotating weak link

et al. 2015

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Motivated by a recent experiment [K. C. Wright et al., Phys. Rev. Lett. 110, 025302 (2013)], we investigate deterministic discontinuous jumps between quantized circulation states in a toroidally trapped Bose-Einstein condensate. These phase slips are induced by vortex excitations created by a rotating weak link. We analyze the influence of a localized condensate density depletion and atomic superflows, governed by the rotating barrier, on the energetic and dynamical stability of the vortices in the ring-shaped condensate. We simulate in a three-dimensional dissipative mean-field model the dynamics of the condensate using parameters similar to the experimental conditions. Moreover, we consider the dynamics of the stirred condensate far beyond the experimentally explored region and reveal surprising manifestations of complex vortex dynamics.

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“…A variable in z-direction control potential is used to create a rotating repulsive barrier, similar to stirring wave beam used in Bose-Einstein condensates [36][37][38][39]:…”

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confidence: 99%

Spontaneous and engineered transformations of topological structures in nonlinear media with gain and loss

et al. 2019

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In contrast to conservative systems, in nonlinear media with gain and loss the dynamics of localized topological structures can exhibit unique features that can be controlled externally. We propose a robust mechanism to perform topological transformations changing characteristics of dissipative vortices and their complexes in a controllable way. We show that a properly chosen control carries out the evolution of dissipative structures to regime with spontaneous transformation of the topological excitations or drives generation of vortices with control over the topological charge.

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Vortex excitation in a stirred toroidal Bose-Einstein condensate

Cited by 28 publications

References 38 publications

Resonant wavepackets and shock waves in an atomtronic SQUID

Resonant wavepackets and shock waves in an atomtronic SQUID

Vortices in a toroidal Bose-Einstein condensate with a rotating weak link

Spontaneous and engineered transformations of topological structures in nonlinear media with gain and loss

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