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Topological invariants of Floquet systems: General formulation, special properties, and Floquet topological defects
Shunyu Yao, Zhongbo Yan, Zhong Wang
Periodically driven (Floquet) systems have been under active theoretical and experimental investigations. This paper aims at a systematic study in the following aspects of Floquet…
Experimental discovery of nodal chains
Qinghui Yan, Rongjuan Liu, Zhongbo Yan +4
Three-dimensional (3D) topological nodal points, such as Weyl and Dirac nodes have attracted wide-spread interest across multiple disciplines and diverse material systems. Unlike n…
Floquet multi-Weyl points in crossing-nodal-line semimetals
Zhongbo Yan, Zhong Wang
Weyl points with monopole charge have been extensively studied, however, real materials of multi-Weyl points, whose monopole charges are higher than , have yet to be fou…
Nodal-knot semimetals
Ren Bi, Zhongbo Yan, Ling Lu +1
Topological nodal-line semimetals are characterized by one-dimensional lines of band crossing in the Brillouin zone. In contrast to nodal points, nodal lines can be in topologicall…
Nodal-link semimetals
Zhongbo Yan, Ren Bi, Huitao Shen +3
In topological semimetals, the valence band and conduction band meet at zero-dimensional nodal points or one-dimensional nodal rings, which are protected by band topology and symme…
Majorana Zero Modes Protected by Hopf Invariant in Topologically Trivial Superconductors
Zhongbo Yan, Ren Bi, Zhong Wang
Majorana zero modes are usually attributed to topological superconductors. We study a class of two-dimensional topologically trivial superconductors without chiral edge modes, whic…