Gravitational wave analogs in spin nematics and cold atoms

Chojnacki, Leilee; Pohle, Rico; Yan, Han; Akagi, Yutaka; Shannon, Nic

doi:10.1103/physrevb.109.l220407

Cited by 2 publications

References 78 publications

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A Biological Signature of Quantum Gravity?

Lone

2024

Preprint

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In a recent proposal on the experimental tests of quantum gravity creation of non-Gaussianity in a Bose-Einstein condensate (BEC) has been suggested as a decisive confirmation of quantum gravity. In a related proposal, a gas of ultracold Rb or Cs atoms has previously been suggested as a possible platform for tests of quantum gravity. Since a practical demonstration of above proposals is a very challenging and costly affair, exploring cost-effective alternatives to these technologically demanding experimental protocols becomes very important. We here show that the phenomenon of Bicoid (Bcd) gradient formation in the early fruit fly embryo, considered basically here as a multipartite quantum system with an ensemble of initial states and a unitary evolution U that implements a quantum Newtonian Hamiltonian over this gravitationally interacting system, naturally combines the essential features of above proposals in a single system giving a viable signature of quantum gravity through the creation of non-Gaussianity. We conclude that although the phenomenon of Bcd gradient formation in the early Drosophila embryo is accompanied by quantum gravitational effects, it might need further experiments to verify such a noval claim.

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A Biological Signature of Quantum Gravity?

Lone

2024

Preprint

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Eight-color chiral spin liquid in the S=1 bilinear-biquadratic model with Kitaev interactions

Pohle,

Shannon,

Motome

2024

Phys. Rev. Research

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Multipolar spin systems provide a rich ground for the emergence of unexpected states of matter due to their enlarged spin degree of freedom. In this study, with a specific emphasis on S=1 magnets, we explore the interplay between spin nematic states and spin liquids. Based on the foundations laid in the prior work [R. Pohle , ], we investigate the S=1 Kitaev model with bilinear-biquadratic interactions, which stabilizes, next to Kitaev spin liquid, spin nematic and triple-q phases, also an exotic chiral spin liquid. Through a systematic reduction of the spin degree of freedom—from CP2 to CP1 and ultimately to a discrete eight-color model—we provide an intuitive understanding of the nature and origin of this chiral spin liquid. We find that the chiral spin liquid is characterized by an extensive ground-state degeneracy, bound by a residual entropy, extremely short-ranged correlations, a nonzero scalar spin chirality marked by Z2 flux order, and a gapped continuum of excitations. Our work contributes not only to the specific exploration of S=1 Kitaev magnets but also to the broader understanding of the importance of multipolar spin degree of freedom on the ground state and excitation properties in quantum magnets. Published by the American Physical Society 2024

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Gravitational wave analogs in spin nematics and cold atoms

Cited by 2 publications

References 78 publications

A Biological Signature of Quantum Gravity?

A Biological Signature of Quantum Gravity?

Eight-color chiral spin liquid in the S=1 bilinear-biquadratic model with Kitaev interactions

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