NanoESCA Next-generation photoemission tool for real- and momentum-space microscopy Live View energy-filtered real & momentum space imaging Precise sample spot definition for small area ARPES One-shot 180° ARPES overview without sample movement LHe cooled microscope sample stage and dedicated light-sources Excellent 2D imaging energyresolution (< 25 meV)

From microscopy to band-structure mapping Photoemission has a history as one of the leading techniques in material and surface science. In the last decade, 2D k-space imaging or "Momentum Microscopy" has become one of the latest and most promising developments in this field. It allows insight into the electron band-structure of novel material systems, unveiling useful effects that can have a strong impact in future information technology. In combination with real-space imaging it is the ideal tool to make new materials applicable to next-generation devices. B and s tru ctu re is th e k ey to...

Figure 3: The PEEM column can be easily changed between real-space imaging (a) and momentum-space imaging (b) by adjusting the projection lenses. The electron trajectories of both settngs are equal up to the first imaging plane to allow a reliable positioning of the apertures. The iris-aperture in the first image plane can for example be used to define a small spot on the sample surface (c), from which the momentum-space data can be acquired (d). All shown images were acquired in a 10 s exposure time, the signal being also intense enough for live imaging (500 ms exposure time). The shown images...

The combination of a PEEM column with an electrostatic double-hemispherical imaging energy-analyser makes the NanoESCA one of the most promising concepts for surface and material science of the next decade. The 2D mapping of the complete electron momentum distribution at the Fermi level is extremely interesting for novel materials (graphene, topological insulators, TMDs), and will play an important role in the next generation of devices. Engineering functional devices from these new material systems requires easy switching between real- and momentum space, while the live-imaging ability is the...