3 papers
cond-mat.mtrl-sci2026
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…
cond-mat.mtrl-sci2026
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…
cond-mat.mtrl-sci2026
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…