Gruppe "Electronic structure of quantum materials"

Über

Die elektronischen und magnetischen Eigenschaften von Quantenmaterialien sind in ihren Wellenfunktionen verborgen. Das Verständnis der Wellenfunktionen ist daher für die Entwicklung zukünftiger Quantenkomponenten von entscheidender Bedeutung. Unser Ziel ist es, mithilfe von zirkulardichroitischen und spinpolarisierten Photoemissions-Anregungsspektren diese Wellenfunktionen zu rekonstruieren. Unsere Experimente stützen sich auf die Theorie der Mehrfachstreuung im Photoemissionsprozess. Sie werden sowohl an unserem laserbasierten, hochauflösenden spinpolarisierten Photoemissionssystem am PGI-6 als auch in führenden Synchrotronlaboren weltweit durchgeführt.

Forschungsthemen

  • 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

Kontakt

Dr. Lukasz Plucinski

PGI-6

Gebäude 04.8 / Raum R 256

+49 2461/61-6684

E-Mail

Mitglieder

Forschungsthemen

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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.

Karriere

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

Publikationen

Letzte Änderung: 04.04.2025
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