TY - JOUR
AU - J F Liu
AU - D Kriegner
AU - L Horak
AU - D Puggioni
AU - C. Rayan Serrao
AU - R Chen
AU - D Yi
AU - C Frontera
AU - V Holy
AU - A Vishwanath
AU - J.M Rondinelli
AU - X Marti
AU - Ramamoorthy Ramesh
AB - By using a combination of heteroepitaxial growth, structure refinement based on synchrotron x-ray diffraction, and first-principles calculations, we show that the symmetry-protected Dirac line nodes in the topological semimetallic perovskite SrIrO3 can be lifted simply by applying epitaxial constraints. In particular, the Dirac gap opens without breaking the Pbnm mirror symmetry. In virtue of a symmetry-breaking analysis, we demonstrate that the original symmetry protection is related to the n-glide operation, which can be selectively broken by different heteroepitaxial structures. This symmetry protection renders the nodal line a nonsymmorphic Dirac semimetallic state. The results highlight the vital role of crystal symmetry in spin-orbit-coupled correlated oxides and provide a foundation for experimental realization of topological insulators in iridate-based heterostructures. © 2016 American Physical Society.
BT - Physical Review B
DO - 10.1103/PhysRevB.93.085118
LA - eng
M1 - 8
N1 - cited By 52
N2 - By using a combination of heteroepitaxial growth, structure refinement based on synchrotron x-ray diffraction, and first-principles calculations, we show that the symmetry-protected Dirac line nodes in the topological semimetallic perovskite SrIrO3 can be lifted simply by applying epitaxial constraints. In particular, the Dirac gap opens without breaking the Pbnm mirror symmetry. In virtue of a symmetry-breaking analysis, we demonstrate that the original symmetry protection is related to the n-glide operation, which can be selectively broken by different heteroepitaxial structures. This symmetry protection renders the nodal line a nonsymmorphic Dirac semimetallic state. The results highlight the vital role of crystal symmetry in spin-orbit-coupled correlated oxides and provide a foundation for experimental realization of topological insulators in iridate-based heterostructures. © 2016 American Physical Society.
PB - American Physical Society
PY - 2016
T2 - Physical Review B
TI - Strain-induced nonsymmorphic symmetry breaking and removal of Dirac semimetallic nodal line in an orthoperovskite iridate
VL - 93
SN - 24699950
ER -