Time resolved photoemission of Sr$_2$IrO$_4$
C. Piovera, V. Brouet, E. Papalazarou, M. Caputo, M. Marsi, A., Taleb-Ibrahimi, B. J. Kim, and L. Perfetti
TL;DR
This study uses time-resolved photoemission to explore the ultrafast electronic dynamics in Sr$_2$IrO$_4$, revealing rapid relaxation and cooling processes that suggest similarities with copper oxide superconductors.
Contribution
It provides the first detailed measurement of ultrafast electronic relaxation times in Sr$_2$IrO$_4$, highlighting its dynamic similarities to cuprates.
Findings
Doublon-holon pairs relax within 70 fs
Low energy excitations cool in two steps: 120 fs and 1 ps
Electronic dynamics in Sr$_2$IrO$_4$ resemble those in copper oxides
Abstract
We investigate the temporal evolution of electronic states in strontium iridate SrIrO. 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 fs. The subsequent cooling of low energy excitations takes place in two step: a rapid dynamics of fs is followed by a slower decay of ps. The reported timescales endorse the analogies between SrIrO and copper oxides.
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