Journal
PHYSICAL REVIEW B
Volume 89, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.89.115115
Keywords
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Funding
- Deutsche Forschungsgemeinschaft [Sfb 616, SPP 1458]
- Mercator Research Center Ruhr [PR-2011-0003]
- European Union [280555 (GO FAST)]
- Center for Emergent Superconductivity (CES)
- US DOE, Office of Basic Energy Sciences
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The dressing of quasiparticles in solids is investigated by changes in the electronic structure E(k) driven by femtosecond laser pulses. Employing time-and angle-resolved photoemission on an optimally doped cuprate above T-c, 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 E(k) 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 k(F) 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.
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