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arXiv 1509.02147cond-mat.str-elcond-mat.mes-hallquant-ph
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Kalmeyer-Laughlin波函数的边缘态

Edge states for the Kalmeyer-Laughlin wave function

Benedikt Herwerth, Germán Sierra, Hong-Hao Tu, J. Ignacio Cirac, Anne E. B. Nielsen

摘要:

我们研究了由SU(2)$_1$ Wess-Zumino-Witten共形场论得到的格点波函数。根据Moore和Read的构造,将Kalmeyer-Laughlin分数量子Hall态定义为一个初级场的关联函数。通过引入Kac-Moody电流,我们将共形场论的每一个态与一个波函数联系起来。这些波函数跨越格点系统的完整希尔伯特空间。在圆柱面上,我们用解析方法研究了晶格态的整体性质,并用Metropolis Monte Carlo方法数值计算了关联函数。通过比较短程体相关性,数值证据提供了一个当前运营商的状态表示在热力学极限的边缘状态。我们发现,具有一个最低阶的Kac-Moody电流的边缘态与局部哈密顿量的低能激发态有很好的重叠,其中Kalmeyer-Laughlin态近似于基态。对于某些状态,精确的父哈密顿推导出的圆柱。这些哈密顿量是SU(2)不变的,并且在四体相互作用下是非定域的。

英文摘要:

We study lattice wave functions obtained from the SU(2)$_1$ Wess-Zumino-Witten conformal field theory. Following Moore and Read's construction, the Kalmeyer-Laughlin fractional quantum Hall state is defined as a correlation function of primary fields. By an additional insertion of Kac-Moody currents, we associate a wave function to each state of the conformal field theory. These wave functions span the complete Hilbert space of the lattice system. On the cylinder, we study global properties of the lattice states analytically and correlation functions numerically using a Metropolis Monte Carlo method. By comparing short-range bulk correlations, numerical evidence is provided that the states with one current operator represent edge states in the thermodynamic limit. We show that the edge states with one Kac-Moody current of lowest order have a good overlap with low-energy excited states of a local Hamiltonian, for which the Kalmeyer-Laughlin state approximates the ground state. For some states, exact parent Hamiltonians are derived on the cylinder. These Hamiltonians are SU(2) invariant and nonlocal with up to four-body interactions.

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