Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.77: Poster

Dienstag, 1. April 2014, 18:30–22:00, P1

Setup of a HHG-ARPES experiment with sub-femtosecond XUV pulses — •Jürgen Schmidt¹, Sabbir Ahsan², Alexander Guggenmos¹, Soo Hoon Chew¹, and Ulf Kleineberg¹ — ¹LMU Physics Department, Munich, Germany — ²KTH Royal Institute of Technology, Stockholm, Sweden

Attosecond electron streaking spectroscopy from solids using single attosecond XUV pump pulses and few-cycle IR streaking pulses has recently revealed first insight into the temporal dynamics of the photoemission process with unprecedented temporal resolution of 100 as [1]. Due to the inherent nature of the energy streaking of the liberated electrons in the IR polarization field, only electrons emitted perpendicular from the surface have been recorded. Our experimental setup however aims for both time- and angle-resolving photoelectron spectroscopy (TR-ARPES) revealing information about the sub-fs temporal band structure dynamics in energy and momentum space after transient excitation by few-cycle NIR laser pulses. Especially materials with high correlated electron systems (such as high Tc materials, exchange split materials or topological insulators) give indications for electron dynamics on a sub-fs time scale. As a proof of principle experiment we report about the setup and first measurements on a tungsten (110) surface.

[1] Cavalieri et al, Nature 449, 1029 (2007)