Isolation of spin-valley locked nodal-line fermions in $d$-wave $\mathrm{A}{\mathrm{V}}_2{\mathrm{X}}_2\mathrm{O}$ altermagnets

Pritesh Srivastava, Rahul Verma, Bahadur Singh

Crystalline symmetries stabilize topological states with distinct electronic properties, while altermagnets exhibit momentum-dependent spin splitting without net magnetization. Her…