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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
Millimeter-Scale, Atomically Controlled 2D Topological Insulators Revealed by Multimodal Spectroscopy
Woojoo Lee, Qiang Gao, Yufei Zhao +20
Quantum spin Hall insulators, or synonymously known as 2D topological insulators, are crucial 2D systems hosting topologically protected edge states. The working temperature of thi…