Photoinduced changes in the cuprate electronic structure revealed by femtosecond time- and angle-resolved photoemission

J. D. Rameau; S. Freutel; L. Rettig; I. Avigo; M. Ligges; Y. Yoshida; H. Eisaki; J. Schneeloch; R. D. Zhong; Z. J. Xu; G. D. Gu; P. D. Johnson; U. Bovensiepen

doi:10.1103/PhysRevB.89.115115

Photoinduced changes in the cuprate electronic structure revealed by femtosecond time- and angle-resolved photoemission

J. D. Rameau, S. Freutel, L. Rettig, I. Avigo, M. Ligges, Y. Yoshida, H. Eisaki, J. Schneeloch, R. D. Zhong, Z. J. Xu, G. D. Gu, P. D. Johnson, U. Bovensiepen

DOI 10.1103/PhysRevB.89.115115 · Physical Review B

T1

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Abstract

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 Tc, 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 kF 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	onset