Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Ultrafast Electron and Spin Dynamics

O 69.9: Poster

Mittwoch, 18. März 2015, 18:15–21:00, Poster A

Time-resolved photoelectron spectroscopy in a back-pump/front-probe geometry — •Gerrit Horstmann, Simon Lange, Claus Ropers, and Sascha Schäfer — IV. Physical Institute, Friedrich-Hund-Platz 1, University of Göttingen, Germany

The combination of ultrafast pump-probe techniques with angle-resolved photoelectron spectroscopy (ARPES) has enabled the detailed investigation of ultrafast electron dynamics in condensed matter. However, the influence of fundamental transport processes such as electron scattering in bulk material or at interfaces as well as propagation through functional layers is difficult to access in time-resolved photoelectron spectroscopy (tr-PES). Here, we present a flexible tr-PES setup allowing for optical sample excitation at the backside of an ultrathin film combined with time- and angle-resolved photoelectron probing at the film's front surface. In a first step, we study the photoemission from back-pumped homogeneous metal films on sapphire substrates, characterizing the delay-dependent spectral and angular distributions of photoemitted electrons. Possible future applications are discussed, e.g., for the investigation of optically-triggered conductivity changes in correlated materials.