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首页> 外文期刊>Physical Review X >Spin-Ice Thin Films: Large- N Theory and Monte?Carlo Simulations
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Spin-Ice Thin Films: Large- N Theory and Monte?Carlo Simulations

机译：旋转冰薄膜：大学理论和蒙特？卡洛模拟

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We explore the physics of highly frustrated magnets in confined geometries, focusing on the Coulomb phase of pyrochlore spin ices. As a specific example, we investigate thin films of nearest-neighbor spin ice, using a combination of analytic large- N techniques and Monte?Carlo simulations. In the simplest film geometry, with surfaces perpendicular to the [001] crystallographic direction, we observe pinch points in the spin-spin correlations characteristic of a two-dimensional Coulomb phase. We then consider the consequences of crystal symmetry breaking on the surfaces of the film through the inclusion of orphan bonds. We find that when these bonds are ferromagnetic, the Coulomb phase is destroyed by the presence of fluctuating surface magnetic charges, leading to a classical Z 2 spin liquid. Building on this understanding, we discuss other film geometries with surfaces perpendicular to the [110] or the [111] direction. We generically predict the appearance of surface magnetic charges and discuss their implications for the physics of such films, including the possibility of an unusual Z 3 classical spin liquid. Finally, we comment on open questions and promising avenues for future research.
机译：我们探讨了狭窄的几何形状中高度沮丧的磁铁的物理，专注于烧焦旋转冰的库仑阶段。作为一个具体示例，我们研究了最近邻居旋转冰的薄膜，使用分析大量技术和蒙特·摩尔模拟的组合。在最简单的薄膜几何形状中，垂直于晶体方向的表面，我们观察到二维库仑相的旋转旋转相关性的夹点。然后，我们通过包含孤儿键来考虑晶体对称在膜表面上破碎的后果。我们发现，当这些键是铁磁性时，库仑相通过存在波动的表面磁性电荷而破坏，导致经典Z2旋液。建立在这种理解上，我们讨论具有垂直于[110]或[111]方向的表面的其他电影几何形状。我们通常预测表面磁性电荷的外观，并讨论它们对这种薄膜的物理学的影响，包括不寻常的Z 3典型自旋液体的可能性。最后，我们对未来研究的开放性问题和有前途的途径发表评论。

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