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We have synthesized epitaxial Sr2IrO4 thin-films on various substrates andstudied their electronic structures as a function of lattice-strains. Undertensile (compressive) strains, increased (decreased) Ir-O-Ir bond-angles areexpected to result in increased (decreased) electronic bandwidths. However, wehave observed that the two optical absorption peaks near 0.5 eV and 1.0 eV areshifted to higher (lower) energies under tensile (compressive) strains,indicating that the electronic-correlation energy is also affected by in-planelattice-strains. The effective tuning of electronic structures underlattice-modification provides an important insight into the physics driven bythe coexisting strong spin-orbit coupling and electronic correlation.

Tuning electronic structures via epitaxial strain in Sr2IrO4 thin films