Symmetry breaking in binary Bose-Einstein condensates in the presence of an inhomogeneous artificial gauge field

Hejazi, S. Sahar S.; Polo, J.; Sachdeva, Rashi; Busch, Thomas

doi:10.1103/physreva.102.053309

Cited by 21 publications

(8 citation statements)

References 53 publications

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“…Indeed, they can be found in Bose-Bose [31] and in Bose-Fermi [32] mixtures, where they are generated by collective excitations and the Landau instability [33] with negative excitation frequency. They are also found in dipolar BECs [25], in mixtures featuring the Rashba-Dresselhaus spin-orbit coupling [34,35], in the presence of an inhomogeneous artificial gauge field [36], and in self-bound quantum droplets [37].…”

Section: Introductionmentioning

confidence: 86%

Making ghost vortices visible in two-component Bose-Einstein condensates

Chaika¹,

Richaud²,

Yakimenko³

2023

Preprint

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Ghost vortices constitute an elusive class of topological excitations in quantum fluids since the relevant phase singularities fall within regions where the superfluid density is almost zero. Here we present a platform that allows for the controlled generation and observation of such vortices. Upon rotating an imbalanced mixture of two-component Bose-Einstein condensates (BECs), one can obtain necklaces of real vortices in the majority component whose cores get filled by particles from the minority one. The wavefunction describing the state of the latter is shown to harbour a number of ghost vortices which are crucial to support the overall dynamics of the mixture. Their arrangement typically mirrors that of their real counterpart, hence resulting in a "dual" ghostvortex necklace, whose properties are thoroughly investigated in the present paper. We also present a viable experimental protocol for the direct observation of ghost vortices in a 23 Na + 39 K ultracold mixture. Quenching the inter-component scattering length, some atoms are expelled from the vortex cores and, while diffusing, swirl around unpopulated phase singularities, thus turning them directly observable.

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Section: Introductionmentioning

confidence: 86%

Making ghost vortices visible in two-component Bose-Einstein condensates

Chaika¹,

Richaud²,

Yakimenko³

2023

Preprint

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“…It can be naively expected that applying a localized (inhomogeneous) gauge field to the system results in local excitations around the field lines; this does occur, as shown in [52], which leads to an interesting phase separation in the immiscible regime. In this work, we demonstrate that localized magnetic fields can also induce global currents.…”

Section: Local and Global Currents In Ring Trapsmentioning

confidence: 99%

“…In such fields, the vortex structures appear at the high intensity of the effective magnetic field [38]. This position dependence of the gauge field leads to various interesting features, such as the symmetry breaking of the density profile of the two-coupled BECs [52] and also the creation of a position-dependent structure of vortices in the condensate.…”

Section: Introductionmentioning

confidence: 99%

Formation of local and global currents in a toroidal Bose-Einstein condensate via an inhomogeneous artificial gauge field

2022

Self Cite

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We study the effects of a position-dependent artificial gauge field on an atomic Bose-Einstein condensate in quasi-one-dimensional and two-dimensional ring settings. The inhomogeneous artificial gauge field can induce global and local currents in the Bose-Einstein condensate via phase gradients along the ring and vortices, respectively. We observe two different regimes in the system depending on the radial size of the ring and the strength of the gauge field. For weak artificial gauge fields, the angular momentum increases, as expected, in a quantized manner; however, for stronger values of the fields, the angular momentum exhibits a linear (nonquantized) behavior. We also characterize the angular momentum for noncylindrically symmetric traps.

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“…Symmetry breaking phenomenon in nonlinear quantum systems is a basic phenomenon attributed to the interaction of nonlinear and symmetric linear potentials [1]. Symmetry breaking has been extensively studied in Bose-Einstein condensates [5][6][7], lasers [8], liquid crystals [9], etc. In nonlinear optics, with the increase of power, one or more asymmetrical states appear in the system, namely, the phenomenon of the symmetry breaking [2][3][4], which has been reported successively in thin film optical mechanics [10], moving medium [11], laser dynamics [12] and one-dimensional PT-symmetric optical potential [13].…”

Section: Introductionmentioning

confidence: 99%

Symmetry Breaking of PT-symmetric Solitons in Self-defocusing Saturable Nonlinear Schrödinger Equation

Bo¹,

Dai

Wang

et al. 2021

Preprint

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The symmetry breaking phenomenon of the parity-time (PT) symmetric solitons in self-defocusing saturable nonlinear Schrödinger equation is studied. As the soliton power increases, branches of asymmetric solitons are separated from antisymmetric solitons, and they coexist with both symmetric and antisymmetric solitons. The anti-symmetric solitons require different power thresholds when they are under different saturable nonlinear strength. The stronger the saturable nonlinearity is, the larger the power threshold is. The saturable nonlinear strength has obvious modulation effect on the symmetry breaking of antisymmetric solitons and the bifurcation of the power curve. However, when the modulation strength of PT- symmetric potential increases, the effect of this modulation effect weakens. The antisymmetric solitons are only stable in the low power region, and the stability of symmetric and asymmetric solitons is less affected by the soliton power. The increase of the saturable nonlinear strength leads to the increase of the critical power of the symmetry breaking. When a beam propagates in a PT-symmetric optical waveguide, the symmetry breaking of antisymmetric solitons can be controlled by changing the saturable nonlinear strength.

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Symmetry breaking in binary Bose-Einstein condensates in the presence of an inhomogeneous artificial gauge field

Cited by 21 publications

References 53 publications

Making ghost vortices visible in two-component Bose-Einstein condensates

Making ghost vortices visible in two-component Bose-Einstein condensates

Formation of local and global currents in a toroidal Bose-Einstein condensate via an inhomogeneous artificial gauge field

Symmetry Breaking of PT-symmetric Solitons in Self-defocusing Saturable Nonlinear Schrödinger Equation

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