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
复制标题
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
复制
发表时间:
2017
期刊:
影响因子:
--
通讯作者:
H. Fehske
中科院分区:
文献类型:
--
作者:
Bastian Höckendorf;Andreas Alvermann;H. Fehske
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.
影响因子:
56.9
作者:
Flaeschner, N.;Rem, B. S.;Weitenberg, C.
通讯作者:
Weitenberg, C.