SFB/TRR 173 SPIN+X

Second Funding Period 2020-2023:

A02 Spin+Phase-Change: Competing interactions of spin with charge and lattice

JProf. Dr. Benjamin Stadtmüller (Department of Physics, TU Kaiserslautern)
Prof. Dr. Martin Aeschlimann (Department of Physics, TU Kaiserslautern)
Prof. Dr. Gerd Schönhense (Institute of Physics, JGU Mainz)

In project A02, PIs from both universities collaborate closely to investigate the fundamental interactions of spins with charge and lattice during optically induced phase transition in magnetic materials. Therefore, this project will establish the first complete photoemission experiment to study the non-equilibrium spin, charge, and lattice dynamics of optically excited states on a femtosecond timescale. We aim at implementing a novel multi-transition time approach to disentangle the spin, charge, and lattice dynamics in momentum space. This will allow us to uncover new spin-dependent interactions and yet unknown energy and (angular) momentum dissipation mechanisms of spin carriers in matter.

 

First Funding Period 2016-2019:

A02  Spin+Phase-Change: Competing interactions of spin with charge and lattice

JProf. Dr. Benjamin Stadtmüller (Department of Physics, TU Kaiserslautern)
Prof. Dr. Martin Aeschlimann (Department of Physics, TU Kaiserslautern)
Prof. Dr. Gerd Schönhense (Institute of Physics, JGU Mainz)

In project A02 PIs from both universities collaborate closely in order to reveal the role of spin-charge-lattice interactions in optically induced phase transitions occurring in magnetic, functional, and correlated-electron materials. Most interestingly, competing interactions of spin with charge and lattice, governed by spin-orbit interactions, yield rich phase diagrams of states in novel correlated-electron materials. Magnetically ordered phases are often in direct competition with other ordered phases, as for instance charge-ordered phases. In thermal equilibrium the dominant interaction that is responsible for the formation of a specific phase is generally difficult to determine. Implementing and employing a novel time-resolved and spin-sensitive XUV momentum microscopy technique, the spin-resolved transient band-structure during the optically induced loss of order will be studied on a femtosecond timescale. Therefore, the spin-dynamics in its collective environment can be investigated in a direct manner.

Aim 1: Establishing a novel method for a complete photoemission experiment based on momentum microscopy that is sensitive to time-, spin-, momentum-, energy-, and spatially-resolved band-structure dynamics throughout the entire Brillouin zone;

Aim 2: Understanding the role of spin-charge-lattice interactions of optically induced phase transitions in magnetic, functional and correlated-electron materials.

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