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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Quantum dynamics and entanglement of spins on a square lattice
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Quantum dynamics and entanglement of spins on a square lattice

机译：方格上自旋的量子动力学和纠缠

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摘要

Bulk magnetism in solids is fundamentally quantum mechanical in nature. Yet in many situations, including our everyday encounters with magnetic materials, quantum effects are masked, and it often suffices to think of magnetism in terms of the interaction between classical dipole moments. Whereas this intuition generally holds for ferromagnets, even as the size of the magnetic moment is reduced to that of a single electron spin (the quantum limit), it breaks down spectacularly for antiferromagnets, particularly in low dimensions. Considerable theoretical and experimental progress has been made in understanding quantum effects in one-dimensional quantum antiferromagnets, but a complete experimental description of even simple two-dimensional antiferromagnets is lacking. Here we describe a comprehensive set of neutron scattering measurements that reveal a non-spin-wave continuum and strong quantum effects, suggesting entanglement of spins at short distances in the simplest of all two-dimensional quantum antiferromagnets, the square lattice Heisenberg system.
机译：固体中的体磁本质上本质上是量子力学。然而，在许多情况下，包括我们与磁性材料的日常相遇，量子效应被掩盖了，通常就可以通过经典偶极矩之间的相互作用来考虑磁性。尽管这种直觉通常适用于铁磁体，但即使磁矩的大小减小到单个电子自旋的大小（量子极限），反铁磁体也会明显地分解，特别是在小尺寸的情况下。在理解一维量子反铁磁体中的量子效应方面已经取得了相当大的理论和实验进展，但是甚至没有简单的二维反铁磁体的完整实验描述。在这里，我们描述了一套完整的中子散射测量结果，揭示了一个非自旋波连续体和强量子效应，这表明在所有二维量子反铁磁体中最简单的自旋纠缠是正方形的海森堡系统。

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