Controlled Generation and Manipulation of Vortex Dipoles in a Bose-Einstein Condensate

Aioi, Tomohiko; Kadokura, Tsuyoshi; Kishimoto, T.; Saito, Hiroki

doi:10.1103/physrevx.1.021003

Cited by 64 publications

(67 citation statements)

References 36 publications

(77 reference statements)

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“…In Ref. [30], vortex shedding from a moving attractive obstacle of V 0 /µ < 0 was numerically studied, showing that d increases with higher v, which is opposite to our observation. Further theoretical studies are warranted to understand what determines the size of the vortex dipole when it is generated from a moving penetrable obstacle.…”

Section: Deterministic Generation Of a Single Vortex Dipolecontrasting

confidence: 55%

“…For example, as suggested in Ref. [30], if two laser beams are employed to generate two vortex dipoles separately at different positions in a condensate, it would be possible to investigate collision dynamics of vortex dipoles in a controlled manner. Dipole-dipole collisions are particularly interesting in that vortex pair annihilation may occur during the collision.…”

Section: Discussionmentioning

confidence: 99%

“…It needs to be mentioned that we cannot exclude the possibility that the crescent-shaped density dimple is a rarefaction pulse or a gray soliton, which can also propagate with preserving its density profile with a nonzero density minimum [25,[29][30][31]. When the energy accumulated by the moving obstacle is not sufficient to generate a vortex dipole, it can possibly transform into lower energy excitation.…”

Section: Deterministic Generation Of a Single Vortex Dipolementioning

confidence: 99%

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Periodic shedding of vortex dipoles from a moving penetrable obstacle in a Bose-Einstein condensate

2015

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We investigate vortex shedding from a moving penetrable obstacle in a highly oblate Bose-Einstein condensate. The penetrable obstacle is formed by a repulsive Gaussian laser beam that has the potential barrier height lower than the chemical potential of the condensate. The moving obstacle periodically generates vortex dipoles and the vortex shedding frequency fv linearly increases with the obstacle velocity v as fv = a(v − vc), where vc is a critical velocity. Based on periodic shedding behavior, we demonstrate deterministic generation of a single vortex dipole by applying a short linear sweep of a laser beam. This method will allow further controlled vortex experiments such as dipole-dipole collisions.

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Section: Deterministic Generation Of a Single Vortex Dipolecontrasting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Deterministic Generation Of a Single Vortex Dipolementioning

confidence: 99%

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Periodic shedding of vortex dipoles from a moving penetrable obstacle in a Bose-Einstein condensate

2015

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“…An elongated oblate BEC, as used in the Berkeley experiment [4], would be suitable. An initial vortex dipole can be created by an external laser beam shifting in a BEC [25,26]. A half-quantum vortex-dipole, as shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…1(g) can also be understood to be the result of the vortex-vortex interaction in an effectively two-component BEC. In a sys- tem with inhomogeneous density, a vortex with circulation κ moves in the direction of ∇ρ × κ, i.e., in a direction perpendicular to the density gradient [26]. Suppose that vortices in the m = 1 and −1 components are located at the origin and in its vicinity, respectively.…”

Section: Propagation Of a Vortex Dipole From Ferromagnetic To Pomentioning

confidence: 99%

Dynamics of a vortex dipole across a magnetic phase boundary in a spinor Bose-Einstein condensate

Kaneda

Saito

2014

Phys. Rev. A

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Dynamics of a vortex dipole in a spin-1 Bose-Einstein condensate in which magnetic phases are spatially distributed is investigated. When a vortex dipole travels from the ferromagnetic phase to the polar phase, or vice versa, it penetrates the phase boundary and transforms into one of the various spin vortex dipoles, such as a leapfrogging ferromagnetic-core vortex dipole and a halfquantum vortex dipole. Topological connections of spin wave functions across the phase boundary are discussed.

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Quantized Vortices and Quantum Turbulence

Tsubota

Kasamatsu

2013

Physics of Quantum Fluids

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Abstract. We review recent important topics in quantized vortices and quantum turbulence in atomic Bose-Einstein condensates (BECs). They have previously been studied for a long time in superfluid helium. Quantum turbulence is currently one of the most important topics in low-temperature physics. Atomic BECs have two distinct advantages over liquid helium for investigating such topics: quantized vortices can be directly visualized and the interaction parameters can be controlled by the Feshbach resonance. A general introduction is followed by a description of the dynamics of quantized vortices, hydrodynamic instability, and quantum turbulence in atomic BECs. IntroductionBose-Einstein condensation is often considered to be a macroscopic quantum phenomenon because bosons occupy the same single-particle ground state below the critical temperature for Bose-Einstein condensation so that they have a macroscopic wave function (order parameter) Ψ (r, t) = |Ψ (r, t)|e iθ(r,t) that extends over the entire system. Here, the absolute squared amplitude |Ψ | 2 = n gives the condensate density and the gradient of the phase θ(r, t) gives the superfluid velocity field v s = (h/m)∇θ with boson mass m as the potential flow. Since the macroscopic wave function should be single-valued for the space coordinate r, the circulation Γ = v s · dℓ for an arbitrary closed loop in the fluid will be quantized with the quantum κ = h/m. A vortex with such quantized circulation is known as a quantized vortex. Any rotational motion of a superfluid is sustained only by quantized vortices. Hydrodynamics dominated by quantized vortices is called quantum hydrodynamics (QHD), and turbulence comprised of quantized vortices is known as quantum turbulence (QT).A quantized vortex is a stable topological defect that is a characteristic of a Bose-Einstein condensate (BEC). It differs from a vortex in a classical

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Controlled Generation and Manipulation of Vortex Dipoles in a Bose-Einstein Condensate

Cited by 64 publications

References 36 publications

Periodic shedding of vortex dipoles from a moving penetrable obstacle in a Bose-Einstein condensate

Periodic shedding of vortex dipoles from a moving penetrable obstacle in a Bose-Einstein condensate

Dynamics of a vortex dipole across a magnetic phase boundary in a spinor Bose-Einstein condensate

Quantized Vortices and Quantum Turbulence

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