English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Correlated Dirac semimetal phases emerge in lightly doped (Tb- or La-doped)Mott insulator Sr$_2$IrO$_4$, where a d-wave symmetry-breaking order underlyinga pseudogap plays a crucial role in determining the nature of Dirac degeneracy,i.e., whether it is a Dirac line node or Dirac point node. Here, using arealistic five-orbital tight-binding model with a Hubbard U and a semiclassicalBoltzmann transport theory, we systematically study the low-energyelectrodynamic properties of the Dirac semimetal phases in the paramagneticlightly doped Sr$_2$IrO$_4$. We investigate the effects of the d-waveelectronic order and electron doping concentration on the electronic bandstructures and optical properties of various Dirac semimetal phases. Wecalculate the intraband optical conductivity and obtain electrodynamicparameters of dc conductivity, scattering rate, and Drude weight for threeDirac semimetal phases: two are Dirac point-node states observed in the 3%Tb-doped and 5% La-doped Sr$_2$IrO$_4$, and the other is a Dirac line-nodestate. Our results show that the temperature dependence of the electrodynamicparameters is strong in the Tb-doped system while weak in the La-doped andDirac line-node systems, which are consistent with available experimental data.Moreover, using the low-energy effective theory, we also compare thetemperature-dependent screening effect in the Tb- and La-doped systems usinggraphene as a reference. Our paper provides valuable insight for understandingthe transport and optical properties of correlated Dirac semimetal phases inthe doped Sr$_2$IrO$_4$.

Low-energy electrodynamics of Dirac semimetal phases in the doped Mott insulator Sr$_2$IrO$_4$