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arXiv 1211.3733cond-mat.str-el
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分数量子Hall基态的微观哈密顿拓扑刻画

Topological characterization of fractional quantum Hall ground states from microscopic Hamiltonians

Michael P. Zaletel, Roger S. K. Mong, Frank Pollmann

摘要:

我们展示了如何从微观分数量子霍尔(Hohm)哈密顿量开始数值计算表征拓扑序的几个量。为了找到简并基态的集合,我们采用了无限密度矩阵重整化群(iDMRG)方法,该方法基于无限圆柱上的量子态的矩阵乘积态(MPS)表示。为了研究局域准粒子的一个选定的拓扑电荷,我们使用对简并基态作为边界条件的iDMRG。然后,我们表明,得到的波函数上的无限圆柱几何可以适应于一个环面的任意模参数,这使我们能够明确地计算与模块T-变换的非阿贝尔Berry连接。因此,量子尺寸,拓扑自旋,准粒子电荷,手征中心荷,和霍尔粘度的相位可以得到使用的数据完全包含在一个无限圆柱体的纠缠谱。

英文摘要:

We show how to numerically calculate several quantities that characterize topological order starting from a microscopic fractional quantum Hall (FQH) Hamiltonian. To find the set of degenerate ground states, we employ the infinite density matrix renormalization group (iDMRG) method based on the matrix-product state (MPS) representation of FQH states on an infinite cylinder. To study localized quasiparticles of a chosen topological charge, we use pairs of degenerate ground states as boundary conditions for the iDMRG. We then show that the wave function obtained on the infinite cylinder geometry can be adapted to a torus of arbitrary modular parameter, which allows us to explicitly calculate the non-Abelian Berry connection associated with the modular T-transformation. As a result, the quantum dimensions, topological spins, quasiparticle charges, chiral central charge, and Hall viscosity of the phase can be obtained using data contained entirely in the entanglement spectrum of an infinite cylinder.

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