Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces
O 36.24: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster C
Characterization of THz electric field transients by time-resolved photoelectron emission spectroscopy — •Hamed Abbasi1, Ping Zhou1, Florian Diekmann2, Kai Rossnagel2, Martin Mittendorff1, and Uwe Bovensiepen1 — 1University of Duisburg - Essen, Germany. — 2Kiel University, Germany
Energy- and momentum-dependent analysis of THz electric field induced charge carrier dynamics can be achieved on the surface of materials in THz-pump photoemission-probe experiments [1]. Here we report such an experimental setup in which the THz field is generated at 250 kHz repetition rate using a photoconductive antenna [2], with which we obtained a field with 1 THz center frequency and 0.5 ps duration. We have synchronized the THz pulse with an ultrashort UV pulse for time-resolved angle-resolved photoemission spectroscopy. 45meV energy streaking of photoelectrons on the sample surface could be achieved at a cleaved surface of 1T-TaS2 sample, which is correspond to 6 kV/cm THz electric field. The separation of field induced dynamics in the material and acceleration of the emitted photoelectron in vacuum will be discussed.
We thank the DFG for funding through CRC 1242.
[1] Reimann et al. Nature 562, 396 (2018).
[2] Dreyhaupt et al. Appl. Phys. Lett. 86, 121114 (2005).
Keywords: THz-pump photoemission-probe; streaking energy; photoconductive antenna