6 papers
Symmetry-constrained coexistence of charge-three and charge-one Weyl points in nonmagnetic crystals
Ze-Xin Xue, Ke-Xin Pang, Yun-Yun Bai +2
High-charge Weyl semimetals (WSMs), particularly those hosting charge-three Weyl point (C-3 WPs), have attracted considerable interest owing to their unconventional topological pro…
Irreducible Weyl Semimetals
Ke-Xin Pang, Yan Gao
A key objective in Weyl-semimetal (WSM) research is to identify phases built from minimal configurations of Weyl points (WPs), which provide the simplest settings for investigating…
Symmetry-protected triplet Weyl complexes
Yun-Yun Bai, Ke-Xin Pang, Yan Gao +2
The Nielsen-Ninomiya theorem dictates that Weyl nodes must appear in pairs of opposite chirality to preserve global charge neutrality. However, in crystals, specific crystalline sy…
Symmetry-protected four double-Weyl fermions and their topological phase transitions in nonmagnetic crystals
Yun-Yun Bai, Ke-Xin Pang, Yan Gao
Realizing Weyl semimetals (WSMs) with the minimal number of Weyl points (WPs) fundamentally simplifies extracting intrinsic topological responses. While a minimum of four conventio…
Single-pair charge-2 Weyl-Dirac composite semimetals
Hui-Jing Zheng, Ke-Xin Pang, Yun-Yun Bai +2
The Nielsen--Ninomiya theorem requires that the total topological chiral charges in a crystal vanish, a constraint typically satisfied by identical nodes like Weyl--Weyl pairs. Whe…
Symmetry-Protected Minimum of Four Conventional Weyl Points in Nonmagnetic Crystals
Ze-Xin Xue, Ke-Xin Pang, Yun-Yun Bai +3
Realizing nonmagnetic Weyl semimetals (WSMs) with the minimal number of conventional Weyl points (WPs) and a clean Fermi surface remains a central challenge. Here, combining symmet…