Semimetal and Topological Insulator in Perovskite Iridates
By J. Carter, V. Shankar, M. A. Zeb, H. Kee. 2011
174 citations recorded by the source corpus.
The two-dimensional layered perovskite Sr${}_{2}$IrO${}_{4}$ was proposed to be a spin-orbit Mott insulator, where the effect of Hubbard interaction is amplified on a narrow $J$${}_{\mathrm{eff}}=1/2$ band due to strong spin-orbit coupling. On the other hand, the three-dimensional orthorhombic perovskite (Pbnm) SrIrO${}_{3}$ remains metallic. To understand the physical origin of the metallic state and possible transitions to insulating phases, we construct a tight-binding model for SrIrO${}_{3}$. The band structure possesses a line node made of $J$${}_{\mathrm{eff}}=1/2$ bands below the Fermi level. As a consequence, instability toward magnetic ordering is suppressed, and the system remains metallic. This line node, originating from the underlying crystal structure, turns into a pair of three-dimensional nodal points on the introduction of a staggered potential or spin-orbit coupling strength between alternating layers. Increasing this potential beyond a critical strength induces a transition to a strong topological insulator, followed by another transition to a normal band insulator. We propose that materials constructed with alternating Ir- and Rh-oxide layers along the (001) direction, such as Sr${}_{2}$IrRhO${}_{6}$, are candidates for a strong topological insulator.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/7000ac08ba33ed25fa7344cde97fd1ea0414b064
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Citations in the corpus
- Colloquium : Topological band theory (2016, background): “candidate materials, although their topological nature remains elusive.(Wan et al. 2011; Yang, Lu, and Ran 2011; Carter et al. 2012) Among the f-electron systems, attention has been focused on SmB6,(Cooley et al.”
- Weyl and Dirac semimetals in three-dimensional solids (2017, unknown): “See for example Carter et al., 2012.”
- Topological semimetals with helicoid surface states (2015, methodology): “m=1, n=0), we got the similar results as the previous study[27], with Dirac nodal line around the Fermi energy.”