Poster: Rh3Si4, a new type-II Dirac semimetal

We report the synthesis of the type II Dirac semimetal Rh₃Si₄, featuring Dirac nodal lines protected by non-symmorphic symmetries. We performed a detailed transport and de Haas van Alphen study at high magnetic fields as function of field orientation, revealing light effective masses. We compare the geometry of the experimental Fermi surface with the one obtained from advanced electronic band structure calculations. The calculations reveal that the Dirac nodes near the Fermi level persist even in the presence of spin-orbit coupling—a rare phenomenon among nodal line semimetals. We will expose the location of the Dirac nodal lines within the First Brillouin zone. The presence of protected nodal lines offers a new platform to study the interplay between crystal symmetry and topological states, potentially leading to applications in devices leveraging topologically protected states.



This work is supported by the Department of Energy, Basic Energy Sciences program, grant # DE-SC0002613 (sample synthesis).

The NHMFL is supported by the National Science Foundation through NSF/DMR-2128556* and the State of Florida.