标题： 拓扑驱动的磁性双层中的无禁闭量子临界性 显示英文标题

标题： Topology-driven deconfined quantum criticality in magnetic bilayers

摘要： 二维量子反铁磁体被认为包含比有序相的激发更基本的物质相。 当将两个这样的自旋系统组合成双层结构时，涌现激发之间的强相互作用可以产生在其任一子系统中未实现的相。 我们表明，二维自旋液体态的临界涨落可以在邻近的反铁磁体中诱导出一个无禁闭的量子临界点。 相关有效场论之间的最相关耦合由每层中涌现规范场的混合陈-西蒙斯项给出。 这描述了一种拓扑电流-电流相互作用。 与局域自旋-自旋相互作用不同，它显著改变了描述反铁磁体尼尔-价键固体转变的理论的重整化群流。 特别是，与之相关的保护耦合常数意味着非平凡的量子临界标度，其特征是在临界区域内关联长度的非普遍幂律发散以及接近它的贝瑞金-科斯特里茨-索利斯发散。 显示英文摘要

摘要： Two-dimensional quantum antiferromagnets are believed to host phases of matter whose excitations are more fundamental than those of the ordered phases. When combining two such spin systems in a bilayer, strong interaction between the emergent excitations can produce phases not realized in either of its subsystems. We show that the critical fluctuations of a two-dimensional spin liquid state can induce a deconfined quantum critical point in a proximate antiferromagnet. The most relevant coupling between the associated effective field theories is given by a mixed Chern-Simons term of the emergent gauge fields in each layer. This describes a topological current-current interaction. In contrast to the local spin-spin interaction, it strongly modifies the renormalization group flow of the theory describing the N\'eel-valence-bond-solid transition of the antiferromagnet. In particular, the protected coupling constant associated with it implies non-trivial quantum critical scaling characterized by a non-universal power-law divergence of the correlation length in the critical domain and Berezinskii-Kosterlitz-Thouless divergence approaching it.