SIS - X09LA: Surface / Interface Spectroscopy
The Surface/Interface Spectroscopy (SIS) beamline provides a state-of-the-art experimental set-up to study the electronic band structure of novel complex materials by spin- and angle-resolved photoemission spectroscopies. The beamline operates in the energy range from 20 to 800 eV with high flux, high resolution, variable polarization, and low high-harmonic contamination.
The beamline serves two endstations:
- ULTRA (Ultra Low-Temperature high-Resolution ARPES)
for angle-resolved photoelectron spectroscopy (ARPES) - COPHEE (Complete PHotoEmission Experiment)
for spin- and angle-resolved photoelectron spectroscopy (SARPES)
Users can apply for beamtime with the provided endstations or with their own endstation (after prior consultation with the beamline scientist).
| Energy range | 20 - 800 eV |
|---|---|
| Resolving power (E/Δ E) | 104 |
| Polarization | linear horizontal (20 - 800 eV) linear vertical (40 - 800 eV) circular left/right (50-800 eV) |
| Flux on sample (200 eV) | 2*1013 ph/s/0.1%BW/0.4 A |
| Higher order mode contamination | < 0.1 % |
| Spot size on sample (200 eV) | 50 x 100 µm2 (FWHM) |
Current Highlights and News
Rich electronic features of a kagome superconductor
Spectroscopic insights into the electronic structure of a family of kagome metals bolsters understanding of exotic quantum phenomena
Mobile excitons as neutral information carriers
These quasiparticles have the potential to revolutionise electronics - if they can move. Mobile excitons have now been observed for the first time in a metal.
Unpaired Weyl Point observed for the first time in crystalline solid
Flows need sources and sinks. That’s why, in a new class of exotic materials called Weyl semimetals, the sources and sinks of Berry curvature – dubbed Weyl points – were believed to exist only in pairs. Now researchers at PSI have observed unpaired Weyl points for the first time in a crystalline solid. This discovery, which upends conventional thinking and the so-called Nielson-Niomiya no-go theorem, demonstrates the unique properties of "nodal wall" Weyl semimetals in comparison to conventional Weyl systems having only zero-dimensional Weyl nodes.