Spin nematic order in antiferromagnetic spinor condensates

Abstract

Large spin systems can exhibit unconventional types of magnetic ordering different from the ferromagnetic or Néel-like antiferromagnetic order commonly found in spin 1/2 systems. Spin-nematic phases, for instance, do not break time-reversal invariance and their magnetic order parameter is characterized by a second rank tensor with the symmetry of an ellipsoid. Here we show direct experimental evidence for spin-nematic ordering in a spin-1 Bose-Einstein condensate of sodium atoms with antiferromagnetic interactions. In a mean field description this order is enforced by locking the relative phase between spin components. We reveal this mechanism by studying the spin noise after a spin rotation, which is shown to contain information hidden when looking only at averages. The method should be applicable to high spin systems in order to reveal complex magnetic phases.

published version

References in corpus (8)

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• The quadrupolar phases of the S=1 bilinear-biquadratic Heisenberg model on the triangular lattice
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Cited by in corpus (29)

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• Spontaneous formation and relaxation of spin domains in antiferromagnetic spin-1 quasi-condensates
• Semi-classical simulation of spin-1 magnets
• Flemish Strings of Magnetic Solitons and a Non-Thermal Fixed Point in a One-Dimensional Antiferromagnetic Spin-1 Bose Gas
• Nematic ordering dynamics of an anti-ferromagnetic spin-1 condensate
• Magnetic soliton: from two to three components with SO(3) symmetry
• Stepwise Bose-Einstein condensation in a spinor gas
• Classification of point-group-symmetric orientational ordering tensors
• Relaxation and hysteresis near Shapiro resonances in a driven spinor condensate
• Quantum field theory of nematic transitions in spin orbit coupled spin-1 polar bosons
• Orientational order parameters for arbitrary quantum systems
• Skyrmion quantum spin Hall effect
• Dynamics of a quenched spin-1 antiferromagnetic condensate in a harmonic trap
• Magnetic phase transitions of spin-1 ultracold bosons in a cubic optical lattice
• Triplet FFLO Superconductivity in the doped Kitaev-Heisenberg Honeycomb Model
• Properties of a nematic spin vortex in an antiferromagnetic spin-1 Bose-Einstein condensate
• Gravitational wave analogues in spin nematics and cold atoms
• Metrologically useful states of spin-1 Bose condensates with macroscopic magnetization
• Strongly interacting spin-orbit coupled Bose-Einstein condensates in one dimension
• Phase Diagrams of Antiferromagnetic Spin-1 Bosons on Square Optical Lattice with the Quadratic Zeeman Effect
• Spin-dependent Bragg spectroscopy of a spinor Bose gas
• Phase diagrams and multistep condensations of spin-1 bosonic gases in optical lattices
• Dynamical mean-field driven spinor condensate physics beyond the single-mode approximation
• Nematic-orbit coupling and nematic density waves in spin-1 condensates
• Progress toward a zero-magnetic-field environment for ultracold-atom experiments
• Spin-1 Bose-Hubbard model with two- and three-body interactions
• Emergent quantum field theories on curved spacetimes in spinor Bose-Einstein condensates: from scalar to Proca fields