99,267 research outputs found

    Chern-Insulator Phase in Antiferromagnets

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    The long-sought Chern insulators that manifest a quantum anomalous Hall effect are typically considered to occur in ferromagnets. Here, we theoretically predict the realizabilities of Chern insulators in antiferromagnets, in which the magnetic sublattices are connected by symmetry operators enforcing zero net magnetic moment. Our symmetry analysis provides comprehensive magnetic layer point groups that allow antiferromagnetic (AFM) Chern insulators, revealing that an in-plane magnetic configuration is required. Followed by first-principles calculations, such design principles naturally lead to two categories of material candidates, exemplified by monolayer RbCr4S8 and bilayer Mn3Sn with collinear and noncollinear AFM orders, respectively. We further show that the Chern number could be tuned by slight ferromagnetic canting as an effective pivot. Our work elucidates the nature of the Chern-insulator phase in AFM systems, paving a new avenue for designing quantum anomalous Hall insulators with the integration of nondissipative transport and the promising advantages of the AFM order

    Robert Campbell / Patricia Campbell: A union of artistic sensibilities

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    Catalogue essay by Jann L.M. Bailey. Catalogue of an exhibition held at the Kamloops Art Gallery, Apr. 11-May 19, 1991.Not peer reviewedArtist catalogu

    Unfinished memories

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    Exhibition catalogue of Spencer J. Harrison. Jann L.M. Bailey and Anna-Marie Larson of Kamloops Art Gallery wrote the catalogue essay.Not peer reviewedArtist catalogu

    Unfinished memories

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    Exhibition catalogue of Spencer J. Harrison. Jann L.M. Bailey and Anna-Marie Larson of Kamloops Art Gallery wrote the catalogue essay.Not peer reviewedArtist catalogu

    Singularity Types for Long-Time Chern-Ricci Flow

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    We extend some results known for the Kähler-Ricci flow to the Chern-Ricci flow regarding the independence of singularity types for long-time solutions. Specifically, we show that if a solution to the Chern-Ricci flow exists with uniformly bounded torsion and curvature, then any other solution starting from an initial metric of the same ˉ\partial \bar{\partial} class will also exhibit uniform bounds on torsion and curvature.13 pages, any comments welcome
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