5 papers · 1 filter
Anomalous Collision of Exceptional Points on Nonorientable Manifolds
Weijia Wang, Qicheng Zhang, Kun Zhang +2
Band degeneracies, ranging from Hermitian Dirac points to non-Hermitian exceptional points (EPs), play a central role in topological phase transitions. Beyond the topology of indiv…
Observation of Anti-helical Edge States in Acoustic Metamaterials
Tianzhi Xia, Qicheng Zhang, Chunyin Qiu
As a hallmark of the quantum Hall effect, chiral edge modes (CEMs) counterpropagate along the two parallel edges of a ribbon structure. However, recent studies demonstrate counteri…
Observation of anomalous Floquet non-Abelian topological insulators
Huahui Qiu, Shuaishuai Tong, Qicheng Zhang +2
Non-Abelian topological phases, which go beyond traditional Abelian topological band theory, are garnering increasing attention. This is further spurred by periodic driving, leadin…
Observation of Hybrid-Order Topological Pump in a Kekule-Textured Graphene Lattice
Tianzhi Xia, Yuzeng Li, Qicheng Zhang +3
Thouless charge pumping protocol provides an effective route for realizing topological particle transport. To date, the first-order and higher-order topological pumps, exhibiting t…
Acoustic realization of projective mirror Chern insulators
Tianzi Li, Luohong Liu, Qicheng Zhang +1
Symmetry plays a key role in classifying topological phases. Recent theory shows that in the presence of gauge fields, the algebraic structure of crystalline symmetries needs to be…