Electronic Structure of Quantum Materials Group

About

The electronic and magnetic properties of quantum materials are encoded in their quantum mechanical wave functions. We aim to reconstruct these wave functions, understanding of which is critical in design of future quantum devices, from circular dichroic and spin-polarized photoemission excitation spectra. Our experiments are designed based on the multiple-scattering theory of the photoemission process. They are performed at our high-resolution laser-driver spin-polarized photoemission system at PGI-6 and at leading synchrotron laboratories worldwide.

Research Topics

  • Connection to quantum-geometric tensor
  • Visualization of magnetism in the band structure
  • Spectromicroscopy at the limit of few-atom thickness
  • High-resolution laser-driven spin-ARPES

Contact

Dr. Lukasz Plucinski

PGI-6

Building 04.8 / Room R 256

+49 2461/61-6684

E-Mail

Members

Research Topics

a

Connection to quantum-geometric tensor

Quantum geometic tensor (QGT) determines numerous critical properties of quantum materials. Obtaining a connection beteween QTG and ARPES is a hard problem that requires deep understanding of the physics of photoemission that is based on the multiple scattering theory. Our work focuses on establishing ways to extract intial state spin-polarization and orbital angular momentum from spin-polarized and circular-dichroic ARPES spectra.

a

Visualization of magnetism in the band structure

Magnetization direction M acts as an additionl degree of freedom that can influence topological properties of magnetic materials. Rotating M typically controls opening and closing numerous gaps due to spin-orbit coupling, and these gaps control the intrinsic contribution of the magnetotransport. Our experiments image spin-polarized band structure at high resolution, visualize such M-dependent gaps.

a

Spectromicroscopy at the limit of few-atom thickness

Similar to graphene, many layered materials can be exfoliated down a thickness of few atomic layers, with properties of such layers often dramatically different compared to the bulk. We study such materials, both non-magnetic and magnetic primarily at synchrotron beamlines equipped with photon beam microfocusing. Additional measurements are performed using photoemission microscopy.

a

High-resolution laser-driven spin-ARPES

In PGI-6, we have developed the high-resolution angle-resolved photoemission system, which enables accessing 3D regions of the reciprocal space using single-channel spin-detector.

Careers

If you are interested to work in our group please send an email to L. Plucinski at l.plucinski@fz-juelich.de.

Publications

Last Modified: 04.04.2025
#uk-e-pof-fb-information-nacip-t1#uk-e-rl-portal