Speaker
Description
Time- and angle-resolved photoemission spectroscopy (TR-ARPES) is a powerful technique for exploring intrinsic and light-induced electrodynamics in quantum materials [1]. In this talk, I will present the novel TR-ARPES endstation and the Advanced Laser Light Source (ALLS) user facility. I will show how, by combining sample voltage bias and a hemispherical electron analyzer with next generation deflector technology, we are able to probe a large fraction of the momentum space of quantum materials even with low photon energy ultraviolet light (6 eV).
This technical capability allowed us to investigate electron dynamics driven by mid-infrared light in Bi2Sr2CaCu2O8+x (Bi2212), the prototypical high-temperature cuprate superconductor, far beyond the near-nodal region previously explored [2,3]. I will present preliminary results on the momentum dependence of the light-induced melting of the long-range coherent of the macroscopic superconducting condensate. This study demonstrates the state-of-the-art capabilities of the TR-ARPES endstation at ALLS and provides new insights into the transient evolution of electron interactions in cuprates.
[1] Boschini, Zonno, Damascelli arXiv:2309.03935 (to appear in Reviews of Modern Physics)
[2] Smallwood et al., Science 336, 1137-1139 (2012)
[3] Boschini et al., Nature Materials 17, 416-420 (2018)
| Keyword-1 | Time-resolved photoemission |
|---|---|
| Keyword-2 | cuprates |
| Keyword-3 | ultrafast electron dynamics |
