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Origin of the exciton mass in the frustrated Mott insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Na</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>IrO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>
We use a three-pulse ultrafast optical spectroscopy to study the relaxation processes in a frustrated Mott insulator ${\mathrm{Na}}_{2}{\mathrm{IrO}}_{3}$. By being able to independently produce the out-of-equilibrium bound states (excitons) of doublons and holons with the first pulse and suppress the underlying antiferromagnetic order with the second one, we were able …