Tuning the van Hove singularities in monolayer PbBiI via C3ѵ symmetry breaking

We are happy to announce that Prof. Dr. Tran Cong Phong and colleagues recently published their work entitled "Tuning the van Hove singularities in monolayer PbBiI via C3ѵ symmetry breaking" on Physics Letters A

Abstract

Various filling fractions of the van Hove singularities (vHs) in the vicinity of the Fermi energy give rise to exotic phenomena. Here, we tune vHs in a new family member of quantum spin Hall insulators PbBiI via two mechanisms of C3v symmetry breaking; applying an in-plane magnetization exchange field and an inversion symmetry breaking field. Depending on the mechanism and dispersion direction of host electrons, we find Weyl nodes in the electronic band structure, and in turn, bare vHs deform away from the Fermi energy. Moreover, the number of vHs increases due to the reconstruction of the Fermi surface induced by the above mechanisms. Overall, we indeed propose two efficient mechanisms to tune/create vHs for various emergent applications in optoelectronics.