Non-Hermitian semi-Dirac semi-metals

Understand

Recently, many novel and exotic phases have been proposed by considering the role of topology in non-Hermitian systems, and their emergent properties are of wide current interest.

• In this work we propose the non-Hermitian generalization of semi-Dirac semimetals, which feature a linear dispersion along one momentum direction and a quadratic one along the other.
• We study the topological phase transitions in such two-dimensional semi-Dirac semimetals in the presence of a particle gain-and-loss term.
• We show that such a non-Hermitian term creates exceptional points originating out of each semi-Dirac point.