Magnetic phase diagram of light-mediated spin structuring in cold atoms

Labeyrie, G.; Krešić, Ivor; Robb, G. R. M.; Oppo, Gian-Luca; Kaiser, Robin; Ackemann, T.

doi:10.1364/optica.5.001322

Cited by 20 publications

(74 citation statements)

References 75 publications

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“…A superradiant motional transition also occurs in cavities with spinless thermal atoms [45][46][47]. Self-organization of cold thermal gases and laser arrays due to optical feedback from a single mirror have also been observed [48][49][50][51][52]. What type of nonequilibrium phase transition arises when the pump and cavity fields couple atomic motion and spin?…”

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confidence: 99%

Spinor Self-Ordering of a Quantum Gas in a Cavity

et al. 2018

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We observe the joint spin-spatial (spinor) self-organization of a two-component BEC strongly coupled to an optical cavity. This unusual nonequilibrium Hepp-Lieb-Dicke phase transition is driven by an off-resonant two-photon Raman transition formed from a classical pump field and the emergent quantum dynamical cavity field. This mediates a spinor-spinor interaction that, above a critical strength, simultaneously organizes opposite spinor states of the BEC on opposite checkerboard configurations of an emergent 2D lattice. The resulting spinor density-wave polariton condensate is observed by directly detecting the atomic spin and momentum state and by holographically reconstructing the phase of the emitted cavity field. The latter provides a direct measure of the spin state, and a spin-spatial domain wall is observed. The photon-mediated spin interactions demonstrated here may be engineered to create dynamical gauge fields and quantum spin glasses. arXiv:1807.04915v1 [cond-mat.quant-gas]

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confidence: 99%

Spinor Self-Ordering of a Quantum Gas in a Cavity

et al. 2018

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“…In this paper, we study the phenomenon of self-organization arising in an optically nonlinear sample due to diffractive coupling via single mirror feedback [20,21]. While initial observations of these structures were performed in liquid crystals and warm atomic vapors [22,23], the scheme was recently extended to thermal cold gases, where the nonlinearity can be of optomechanical, electronic saturable, or magnetic origin, with corresponding structuring of atomic density, optical coherence, and magnetization, respectively [5,6,[24][25][26]. These systems are interesting as they have a single pump axis and hence allow for spontaneous symmetry breaking of the translational and rotational degrees of freedom in the plane transverse to this axis, whereas in systems with multiple distinguished axes (e.g., a cavity axis and a pump axis), the potential symmetries and realizations are constrained.…”

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confidence: 99%

Inversion-symmetry breaking in spin patterns by a weak magnetic field

et al. 2019

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Laser-driven cold atoms near a plane retroreflecting mirror exhibit self-organization above a pump threshold. We analyze the properties of self-organized spin patterns in the ground state of cold rubidium atoms. Antiferromagnetic patterns in zero magnetic field give way to ferrimagnetic patterns if a small longitudinal field is applied. We demonstrate how the experimental system can be modeled as spin-1 atoms diffractively coupled by the light reflected by the mirror. The roles of both dipolar and quadrupolar magnetization components in determining the threshold and symmetry variations with a weak longitudinal magnetic field are examined. Although the magnetic structures correspond dominantly to a lattice of magnetic dipoles, the symmetry breaking to ferrimagnetic structures in a finite field is mediated by the coupling to a homogenous quadrupole (alignment), which is not possible in a spin-1/2 system. Our study provides a basis for further exploration of instabilities in driven multilevel systems with feedback.

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“…In order to take into account this dependence and obtain realistic values of the rotation frequency comparable with experiments, we numerically integrate the coupled cavity Eq. (7,8). Estimated values of the pattern rotation frequency are plotted against the rescaled diffusion coefficient D (at fixed temperature T ) for the cases l = 1, .…”

Section: B Numerical Resultsmentioning

confidence: 99%

“…Before presenting numerical results, we show how drifting pattern dynamics arises from Eqs. (7,8), based on the argument from Refs. [22,35].…”

Section: Pattern Dynamics With Structured Phasementioning

confidence: 99%

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Optomechanical Self-Structuring of Cold Atoms with Structured Light

Baio

Robb

Yao

et al. 2019

2019 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Optomechanical pattern forming instabilities in a cloud of cold atoms lead to self-organized spatial structures of light and atoms. Here, we consider the optomechanical self-structuring of a cold atomic cloud in the presence of a phase structured input field, carrying orbital angular momentum. For a planar ring cavity setup, a model of coupled cavity field and atomic density equations describes a wide range of drifting modulation instabilities in the transverse plane. This leads to the formation of rotating self-organized rings of light-atom lattices. Using linear stability analysis and numerical simulations of the coupled atomic and optical dynamics, we demonstrate the presence of macroscopic atomic transport corresponding to the pattern rotation, induced by the structured pump phase profile.

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Magnetic phase diagram of light-mediated spin structuring in cold atoms

Cited by 20 publications

References 75 publications

Spinor Self-Ordering of a Quantum Gas in a Cavity

Spinor Self-Ordering of a Quantum Gas in a Cavity

Inversion-symmetry breaking in spin patterns by a weak magnetic field

Optomechanical Self-Structuring of Cold Atoms with Structured Light

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