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arXiv 1111.2342cond-mat.str-elhep-thquant-ph
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准粒子统计与基态纠缠的编织

Quasi-particle Statistics and Braiding from Ground State Entanglement

Yi Zhang, Tarun Grover, Ari Turner, Masaki Oshikawa, Ashvin Vishwanath

摘要:

拓扑有序的相位是间隙状态,由相互围绕时的激发性质定义。在这里,我们展示了一种方法来提取的统计和编织的激发,只给一组的基态波函数的环面。这是通过研究拓扑纠缠熵(TEE)的分割成两个圆柱体的环面。在这种情况下,一般的考虑决定了TEE通常不同于平凡分区中的TEE,并且取决于所选择的基态。我们的方案的核心是识别具有最小纠缠熵的基态,这反映了拓扑相的准粒子激发。这些状态的变换允许确定编码准粒子性质的模块化S和U矩阵。我们通过提取SU(2)自旋对称手征自旋液相的模S矩阵,用Monte Carlo方法计算TEE,证明了准粒子服从半离子统计.这种方法提供了一种途径,在某些情况下,几乎完全确定的拓扑秩序。

英文摘要:

Topologically ordered phases are gapped states, defined by the properties of excitations when taken around one another. Here we demonstrate a method to extract the statistics and braiding of excitations, given just the set of ground-state wave functions on a torus. This is achieved by studying the Topological Entanglement Entropy (TEE) on partitioning the torus into two cylinders. In this setting, general considerations dictate that the TEE generally differs from that in trivial partitions and depends on the chosen ground state. Central to our scheme is the identification of ground states with minimum entanglement entropy, which reflect the quasi-particle excitations of the topological phase. The transformation of these states allows for a determination of the modular S and U matrices which encode quasi-particle properties. We demonstrate our method by extracting the modular S matrix of an SU(2) spin symmetric chiral spin liquid phase using a Monte Carlo scheme to calculate TEE, and prove that the quasi-particles obey semionic statistics. This method offers a route to a nearly complete determination of the topological order in certain cases.

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