Direct observation of the Dirac nodes lifting in semimetallic perovskite SrIrO3 thin films.

ABSTRACT: Perovskite SrIrO3 has long been proposed as an exotic semimetal induced by the interplay between the spin-orbit coupling and electron correlations. However, its low-lying electronic structure is still lacking. We synthesize high-quality perovskite SrIrO3 (100) films by means of oxide molecular beam epitaxy, and then systemically investigate their low energy electronic structure using in-situ angle-resolved photoemission spectroscopy. We find that the hole-like bands around R and the electron-like bands around U(T) intersect the Fermi level simultaneously, providing the direct evidence of the semimetallic ground state in this compound. Comparing with the density functional theory, we discover that the bandwidth of states near Fermi level is extremely small, and there exists a pronounced mix

SUBMITTER: Liu ZT 

PROVIDER: S-EPMC4960618 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature