Time resolved photoemission of Sr2IrO4
Abstract
We investigate the temporal evolution of electronic states in strontium iridate Sr2IrO4. The time resolved photoemission spectra of intrinsic, electron doped and the hole doped samples are monitored in identical experimental conditions. Our data on intrinsic and electron doped samples, show that primary doublon-holon pairs relax near to the chemical potential on a timescale shorter than 70 fs. The subsequent cooling of low energy excitations takes place in two step: a rapid dynamics of 120 fs is followed by a slower decay of 1 ps. The reported timescales endorse the analogies between Sr2IrO4 and copper oxides.
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