Hubbard excitons in Sr2IrO4 and Sr3Ir2O7 are stable only below the temperature where short-range antiferromagnetic correlations develop, indicating spin-mediated binding.
In the paramagnetic phase of Sr 3Ir2O7, only a positive change in both real and imaginary parts of the optical conductivity is resolved at all time delays (Fig
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Observation of excitons bound by antiferromagnetic correlations
Hubbard excitons in Sr2IrO4 and Sr3Ir2O7 are stable only below the temperature where short-range antiferromagnetic correlations develop, indicating spin-mediated binding.