Dipolar atomic spin ensembles in a double-well potential

Paz, A. de; Naylor, B.; Huckans, John; Carrance, A.; Gorceix, O.; Maréchal, É.; Pedri, P.; Laburthe‐Tolra, B.; Vernac, L.

doi:10.1103/physreva.90.043607

Cited by 10 publications

(7 citation statements)

References 32 publications

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“…The spin-3 BEC exhibits a complex family of phases exhibiting different symmetries [61]. Here we concentrate on 52 Cr, where current measurements of the scattering lengths [62][63][64] predict an A-phase ground state with | F | = 0 in a uniform system. Nevertheless, the DI may influence the structure of singular vortices as they develop superfluid cores with nonzero spin.…”

Section: A Spin-1mentioning

confidence: 99%

“…However, a stronger dipole moment of 6µ B is found in 52 Cr, which can be used to create a spin-3 condensate [46,60]. Measurements of the s-wave scattering lengths [62][63][64] yield c 0 /c 2 ≃ 20, c 0 /c 4 ≃ −4.6, c 0 /c 6 ≃ −1.5 for the contact-interaction strengths in Eq. (15), while c 0 /c d ≃ 177.…”

Section: B Precession-averaged Dipolar Interaction In a Magnetic Fieldmentioning

confidence: 99%

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Internal structure and stability of vortices in a dipolar spinor Bose-Einstein condensate

2017

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We demonstrate how dipolar interactions can have pronounced effects on the structure of vortices in atomic spinor Bose-Einstein condensates and illustrate generic physical principles that apply across dipolar spinor systems. We then find and analyze the cores of singular vortices with non-Abelian charges in the point-group symmetry of a spin-3 52Cr condensate. Using a simpler model system, we analyze the underlying dipolar physics and show how a characteristic length scale arising from the magnetic dipolar coupling interacts with the hierarchy of healing lengths of the s-wave scattering and leads to simple criteria for the core structure: When the interactions both energetically favor the ground-state spin condition, such as in the spin-1 ferromagnetic phase, the size of singular vortices is restricted to the shorter spin-dependent healing length (s-wave or dipolar). Conversely, when the interactions compete (e.g., in the spin-1 polar phase), we find that the core of a singular vortex is enlarged by increasing dipolar coupling. We further demonstrate how the spin alignment arising from the interaction anisotropy is manifest in the appearance of a ground-state spin-vortex line that is oriented perpendicularly to the condensate axis of rotation, as well as in potentially observable internal core spin textures. We also explain how it leads to an interaction-dependent angular momentum in nonsingular vortices as a result of competition with rotation-induced spin ordering. When the anisotropy is modified by a strong magnetic field, we show how it gives rise to a symmetry-breaking deformation of a vortex core into a spin-domain wall

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Section: A Spin-1mentioning

confidence: 99%

Section: B Precession-averaged Dipolar Interaction In a Magnetic Fieldmentioning

confidence: 99%

Internal structure and stability of vortices in a dipolar spinor Bose-Einstein condensate

2017

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“…Therefore, the coherent rapid process in which a thermal atom in is scattered by the condensate to or cannot take place. The incoherent scattering rate can be estimated via with cross-section 68 , and thermal relative velocity 69 . Integratng over space as in 69 yields a time constant for the populations of s, well beyond typical experimental and simulation times.…”

Section: Sodium: Cooling Thanks To Redistribution Of the Thermal Cloumentioning

confidence: 99%

“…The incoherent scattering rate can be estimated via with cross-section 68 , and thermal relative velocity 69 . Integratng over space as in 69 yields a time constant for the populations of s, well beyond typical experimental and simulation times. We expect, though, that a nonzero initial magnetization can help because it opens up other scattering channels.…”

Section: Sodium: Cooling Thanks To Redistribution Of the Thermal Cloumentioning

confidence: 99%

Spin distillation cooling of ultracold Bose gases

Świsłocki

Gajda

Brewczyk

et al. 2021

Sci Rep

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We study the spin distillation of spinor gases of bosonic atoms and find two different mechanisms in $${}^{52}$$ 52 Cr and $$^{23}$$ 23 Na atoms, both of which can cool effectively. The first mechanism involves dipolar scattering into initially unoccupied spin states and cools only above a threshold magnetic field. The second proceeds via equilibrium relaxation of the thermal cloud into empty spin states, reducing its proportion in the initial component. It cools only below a threshold magnetic field. The technique was initially demonstrated experimentally for a chromium dipolar gas (Naylor et al. in Phys Rev Lett 115:243002, 2015), whereas here we develop the concept further and provide an in-depth understanding of the required physics and limitations involved. Through numerical simulations, we reveal the mechanisms involved and demonstrate that the spin distillation cycle can be repeated several times, each time resulting in a significant additional reduction of the thermal atom fraction. Threshold values of magnetic field and predictions for the achievable temperature are also identified.

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“…For one, lattice confinement can be used as a tool to control the kinetic energy scales of atoms, both coherent (tunneling) and incoherent (thermal). Because dipolar interactions survive in the limit of zero tunneling, while still being of physical consequence in non-polarized samples, this has recently allowed for the observation of nonequilibrium quantum magnetism in a lattice-confined sample of bosonic chromium atoms [94]. More recently, the same system has been used to study rich spin dynamics across a range of particle mobilities [69].…”

Section: B Magnetically Dipolar Atomsmentioning

confidence: 99%

Strongly interacting ultracold polar molecules

Gadway

Yan

2016

J. Phys. B: At. Mol. Opt. Phys.

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This paper reviews recent advances in the study of strongly interacting systems of dipolar molecules. Heteronuclear molecules feature large and tunable electric dipole moments, which give rise to long-range and anisotropic dipole-dipole interactions. Ultracold samples of dipolar molecules with long-range interactions offer a unique platform for quantum simulations and the study of correlated many-body physics. We provide an introduction to the physics of dipolar quantum gases, both electric and magnetic, and summarize the multipronged efforts to bring dipolar molecules into the quantum regime. We discuss in detail the recent experimental progress in realizing and studying strongly interacting systems of polar molecules trapped in optical lattices, with particular emphasis on the study of interacting spin systems and non-equilibrium quantum magnetism. Finally, we conclude with a brief discussion of the future prospects for studies of strongly interacting dipolar molecules. * bgadway@illinois.edu † yanbohang@zju.edu.cn arXiv:1607.03528v1 [cond-mat.quant-gas]

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Dipolar atomic spin ensembles in a double-well potential

Cited by 10 publications

References 32 publications

Internal structure and stability of vortices in a dipolar spinor Bose-Einstein condensate

Internal structure and stability of vortices in a dipolar spinor Bose-Einstein condensate

Spin distillation cooling of ultracold Bose gases

Strongly interacting ultracold polar molecules

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