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arXiv 2005.03655cond-mat.str-elquant-ph
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Kitaev蜂窝模型中Chern数的奇偶性与十六重方式

Parity of Chern numbers in the Kitaev honeycomb model and the sixteenfold way

J. -N. Fuchs, S. Patil, J. Vidal

AI总结:

本文研究了Kitaev蜂窝模型中的三角涡旋构型,发现通过添加时间反演对称性破缺项可实现十六种拓扑相中的十四种,并证明了奇数涡旋单胞只能容纳偶数Chern数。

摘要:

在二维中,与$\mathbb{Z}_2$规范场耦合的自由Majorana费米子的拓扑相已知根据Chern数$ν\in \mathbb{Z}$进行分类。其值模16指定了任意子激发的类型。在本文中,我们研究了Kitaev蜂窝模型中的三角涡旋构型(及其对偶构型),并表明通过添加时间反演对称性破缺项可以获得这十六个相中的十四个。缺失的相为$ν=\pm 7$。更一般地,我们证明了任何每个几何单胞中包含奇数个涡旋的周期性涡旋构型只能容纳偶数Chern数,而在其他情况下则可以找到奇数Chern数。

英文摘要:

In two dimensions, topological phases of free Majorana fermions coupled to a $\mathbb{Z}_2$ gauge field are known to be classified according to the Chern number $ν\in \mathbb{Z}$. Its value mod 16 specifies the type of anyonic excitations. In this paper, we investigate triangular vortex configurations (and their dual) in the Kitaev honeycomb model and show that fourteen of these sixteen phases can be obtained by adding a time-reversal symmetry-breaking term. Missing phases are $ν=\pm 7$. More generally, we prove that any periodic vortex configuration with an odd number of vortices per geometric unit cell can only host even Chern numbers whereas odd Chern numbers can be found in other cases.

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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