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arXiv 1407.2852cond-mat.quant-gascond-mat.str-el
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玻色半导体的光谱和纠缠特性

Spectral and Entanglement Properties of the Bosonic Haldane Insulator

Satoshi Ejima, Florian Lange, Holger Fehske

摘要:

本文讨论了扩展的玻色-哈伯德模型描述的一维相互作用系统中非平凡拓扑相的存在性。执行大规模的密度矩阵重整化群计算,我们表明,最近邻排斥的存在下丰富的基态相图的范式玻色-哈伯德模型通过稳定一个新的间隙绝缘状态,所谓的Haldom绝缘体,其中,嵌入到超流,莫特绝缘体,和密度波相位,是由晶格反转对称性的保护。通过冯诺伊曼熵从中心荷确定不同绝缘相之间的量子相变。的Halfton相位揭示了一个特征的纠缠谱的四重简并。最后,我们证明了动态电荷结构因子的强度最大值,可通过布拉格光谱,具有已知的自旋1海森堡链的带隙色散。

英文摘要:

We discuss the existence of a nontrivial topological phase in one-dimensional interacting systems described by the extended Bose-Hubbard model with a mean filling of one boson per site. Performing large-scale density-matrix renormalization group calculations we show that the presence of nearest-neighbor repulsion enriches the ground-state phase diagram of the paradigmatic Bose-Hubbard model by stabilizing a novel gapped insulating state, the so-called Haldane insulator, which, embedded into superfluid, Mott insulator, and density wave phases, is protected by the lattice inversion symmetry. The quantum phase transitions between the different insulating phases were determined from the central charge via the von Neumann entropy. The Haldane phase reveals a characteristic fourfold degeneracy of the entanglement spectrum. We finally demonstrate that the intensity maximum of the dynamical charge structure factor, accessible by Bragg spectroscopy, features the gapped dispersion known from the spin-1 Heisenberg chain.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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