Phase transition from Weyl to self-linked semimetal using bi-circular laser

The Fermi surface topology of a triple non-hermitian (NH) Weyl-semimetal (WSM) driven by bi-circularly (BCL) polarized light is presented in this study. A NH WSM in particular has remarkable outlines. BCL light, however, modifies the symmetry features of NH triple Weyl and causes an unusual new kind of band swapping. We observe swapping between the imaginary bands (with or without exceptional degeneracies), which causes unique Fermi surfaces in the form of double rings and self-links. We also discuss the corresponding changes in the Berry curvature as well.