Emergent spin Hall quantization and high-order van Hove singularities in square-octagonal MA${}_2$Z${}_4$

Rahul Verma, Yash Vardhan, Hsin Lin +1

Quantum spin Hall (QSH) insulators are versatile platforms for exploring exotic quantum phases, especially when combined with high-order van Hove singularities (VHSs) that enhance…