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Low-energy magnetic excitations in the spin-orbital Mott insulator<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>IrO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>
We report a high-field electron spin resonance study in the sub-THz frequency domain of a single crystal of ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$ that has been recently proposed as a prototypical spin-orbital Mott insulator. In the antiferromagnetically ordered state with noncollinear spin structure that occurs in this material at ${T}_{\mathrm{N}}$ $\ensuremath{\approx}$ 240 K we …