ARPES measurements on Dirac nodal-line semimetal candidate TiRhAs

In the family of topological materials, a new Dirac nodal-line (DNL) semimetal TiRhAs was recently predicted by first-principles calculations. Unlike most of DNL semimetals, TiRhAs has a single nodal ring residing near the Fermi level with no interference from other bands, which makes that the carriers in TiRhAs are entirely contributed by nodal-line fermions. Moreover, the calculations show that the hybridization gap induced by SOC is negligible in TiRhAs. Therefore, TiRhAs can be regarded as a hydrogen-atom-like DNL semimetal. By the soft X-ray ARPES, we systemetically studied the band structure of TiRhAs and observed a single nodal ring at kx=0 plane in BZ.