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Correlated vs. conventional insulating behavior in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi mathvariant="normal">J</mml:mi><mml:mi>eff</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mfrac><mml:mn>1</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:mrow></mml:math>vs.<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mfrac><mml:mn>3</mml:mn><mml:mn>2</mml:mn></mml:mfrac></mml:math>bands in the layered iridate<mml:math xmlns:mml="http://www.w3.org/…
We employ molecular beam epitaxy to stabilize ${\mathrm{Ba}}_{2}{\mathrm{IrO}}_{4}$ thin films and utilize in situ angle-resolved photoemission spectroscopy to investigate the evolution of its electronic structure through the N\'eel temperature ${T}_{\mathrm{N}}$. Our measurements indicate that dispersions of the relativistic ${J}_{\mathrm{eff}}=1/2$ and 3/2 bands exhibit an unusual dichotomy in their behavior through …