Abstract
The dressing of quasiparticles in solids is investigated by changes in the electronic structure () driven by femtosecond laser pulses. Employing time- and angle-resolved photoemission on an optimally doped cuprate above , we observe two effects with different characteristic temporal evolutions and, therefore, different microscopic origins. First, a marked change in the effective mass due to the 70-meV kink in () is found to occur during the experiment's 100-fs temporal resolution and is assigned to laser-driven perturbation of an electronic interaction dressing the bare band. Second, a change in is explained by effective photodoping due to particle-hole asymmetry and offers opportunities for ultrafast optoelectronic switches based on an optically driven insulator-superconductor transition.
- Received 20 September 2013
- Revised 22 February 2014
DOI:https://doi.org/10.1103/PhysRevB.89.115115
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