Efficient computation of the W3 topological invariant and application to Floquet–Bloch systems

Efficient computation of the W3 topological invariant and application to Floquet–Bloch systems
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W3 拓扑不变量的高效计算及其在 Floquet-Bloch 系统中的应用

DOI:
10.1088/1751-8121/aa7591
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发表时间:
2017
期刊:
Journal of Physics A: Mathematical and Theoretical
影响因子:
--
通讯作者:
H. Fehske
H. Fehske
中科院分区:
--
文献类型:
--
作者:
Bastian Höckendorf;Andreas Alvermann;H. Fehske

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我们介绍了一个有效的算法计算的W3不变量的一般酉映射,即使在粗离散网格收敛迅速。该算法不需要对酉映射进行大量的操作,不需要确定退化点的精确位置,也不需要固定特征向量的规范。在构造了一般算法之后,我们解释了它在周期驱动二维量子系统的Floquet-Bloch理论中出现的2 + 1维映射中的应用。我们证明了这个应用程序通过计算W3不变量的辐射石墨烯模型与连续调制的汉密尔顿运营商,在那里它预测的异常边缘状态的数量在每个间隙。
We introduce an efficient algorithm for the computation of the W3 invariant of general unitary maps, which converges rapidly even on coarse discretization grids. The algorithm does not require extensive manipulation of the unitary maps, identification of the precise positions of degeneracy points, or fixing the gauge of eigenvectors. After construction of the general algorithm, we explain its application to the 2  +  1 dimensional maps that arise in the Floquet–Bloch theory of periodically driven two-dimensional quantum systems. We demonstrate this application by computing the W3 invariant for an irradiated graphene model with a continuously modulated Hamilton operator, where it predicts the number of anomalous edge states in each gap.
DOI: 10.1126/science.aad4568
发表时间: 2016-05-27
期刊: SCIENCE
影响因子: 56.9
作者:
Flaeschner, N.;Rem, B. S.;Weitenberg, C.
通讯作者: Weitenberg, C.