3 papers
math.DG2025
Short geodesics and multiplicities of eigenvalues of hyperbolic surfaces
Xiang He, Yunhui Wu, Haohao Zhang
In this paper, we obtain upper bounds on the multiplicity of Laplacian eigenvalues for closed hyperbolic surfaces in terms of the number of short closed geodesics and the genus …
cond-mat.mes-hall2025
Unsupervised learning of non-Abelian multi-gap topological phases
Xiangxu He, Ruo-Yang Zhang, Xiaohan Cui +2
Recent experiments have successfully realized multi-band non-Abelian topological insulators with parity-time symmetry. Their topological classification transcends the conventional…
math.SP2025
Prescription of the Robin spectrum
Xiang He, Zuoqin Wang
Let be a compact connected smooth manifold with smooth boundary, and let be a positive continuous function on the boundary which is served as the Robin parameter. In this p…