Band Structure Engineering Lab

Go to TOPOLOGICAL INSULATORS

TOPOLOGICAL INSULATORS

Novel topological phases at interfaces and in superlattices

Go to TRANSITION METAL DICHALCOGENIDES

TRANSITION METAL DICHALCOGENIDES

Mapping electronic structure of atomically thin 2D materials

Go to MAGNETIC THIN FILMS

MAGNETIC THIN FILMS

Ferromagnetism and spin-orbit coupling in 3d and 4f systems

Research Program

Imaging electronic structure of novel quantum materials

High resolution angle-resolved photoemission spectroscopy with the added spin-sensitivity (spin-ARPES) is the technique of choice to probe the electronic structure of crystalline solids. Driven by the interest in understanding the magnetic properties of surface electrons, we map band dispersions and Fermi surfaces of epitaxial thin films and novel materials such as topological insulators.


SpinARPES
Spin polarized E(k) map of the Au(111) Rashba-split surface state (left) measured with our laboratory based spin-ARPES setup (right).

In Jülich we operate the lab-based laser spin-ARPES system that combines high intensity continuous wave 6 eV laser with cryogenic cooling to provide overall energy resolution below 3 meV in spin-intergrated and below 10 meV in spin-resolved mode. The system is also equipped with He and Xe discharge sources. The MBS A-1 hemispherical analyzer has a lens deflector that allows mapping of the Brillouin zone without rotating the sample.

Our photoemission experiments have been performed in the lab in Jülich and at various synchrotron beamlines around the globe, such as Elettra (Italy), ALS (USA), or Soleil (France).

Group members

The group in 2021. From left to right: Xiao, Kevin, Honey, Mohammed, Lukasz. Tristan, Bharti

Tristan Heider

PhD student

Mathias Gehlmann

Former PhD student, now at Berkeley Labs

Markus Eschbach

Former PhD student, now at Carl Zeiss SMT in Oberkochen

Sven Döring

Former postdoc

Alexei Herdt

Former PhD student, now at VW in Wolfsburg