Collaborative Research Center 360
Constrained Quantum Matter
Less is more!
We use carefully chosen constraints to design and
manipulate quantum states in solids, seeking to create new quantum
materials and explore conceptual challenges from quantum information
theory to non-equilibrium physics.
Next year will be the TRR360 International Conference in September 2025. Go here to find out about the details!
2025 James C. McGroddy Prize awarded to Hidenori Takagi
We are very proud to announce that one member of the TRR360, Hidenori Tagaki from the MPI for solid-state research in Stuttgart, will be awarded with the 2025 James C. McGroody Prize for New Materials. He is honoured “for seminal theoretical and experimental research, materials design and discoveries that pioneered the exploration of novel forms of topological quantum matter in spin-orbit assisted Mott insulators realized in transition metal oxides”. The prize will be presented in March 2025.
Next events
Recent Articles
Prodan, L.; Chmeruk, A.; Chioncel, L.; Tsurkan, V.; Kézsmárki, I. Anisotropic charge transport in the easy-plane kagome ferromagnet Fe3Sn Journal Article Phys. Rev. B 110, 094407, 2024. @article{prodan_anisotropic_2024, |
Chen, L.; Sun, Y.; Mankovsky, S.; Meier, T. N. G.; Kronseder, M.; Sun, C.; Orekhov, A.; Ebert, H.; Weiss, D.; Back, C. H. Signatures of magnetism control by flow of angular momentum Journal Article Nature 633, 548–553, 2024. @article{chen_signatures_2024, Exploring new strategies to manipulate the order parameter of magnetic materials by electrical means is of great importance not only for advancing our understanding of fundamental magnetism but also for unlocking potential applications. A well-established concept uses gate voltages to control magnetic properties by modulating the carrier population in a capacitor structure1–5. Here we show that, in Pt/Al/Fe/GaAs(001) multilayers, the application of an in-plane charge current in Pt leads to a shift in the ferromagnetic resonance field depending on the microwave frequency when the Fe film is sufficiently thin. The experimental observation is interpreted as a current-induced modification of the magnetocrystalline anisotropy ΔHA of Fe. We show that (1) ΔHA decreases with increasing Fe film thickness and is connected to the damping-like torque; and (2) ΔHA depends not only on the polarity of charge current but also on the magnetization direction, that is, ΔHA has an opposite sign when the magnetization direction is reversed. The symmetry of the modification is consistent with a current-induced spin6–8 and/or orbit9–13 accumulation, which, respectively, act on the spin and/or orbit component of the magnetization. In this study, as Pt is regarded as a typical spin current source6,14, the spin current can play a dominant part. The control of magnetism by a spin current results from the modified exchange splitting of the majority and minority spin bands, providing functionality that was previously unknown and could be useful in advanced spintronic devices. |
Que, X.; He, Q.; Zhou, L.; Lei, S.; Schoop, L.; Huang, D.; Takagi, H. Visualizing p-orbital texture in the charge-density-wave state of CeSbTe Unpublished 2024, arXiv.2408.07351. @unpublished{que_visualizing_2024, |
Hemmida, M.; Masell, J.; Karube, K.; Ehlers, D.; von Nidda, H. -A. Krug; Tsurkan, V.; Tokura, Y.; Taguchi, Y.; Kézsmárki, I. Role of magnetic anisotropy in the antiskyrmion-host schreibersite magnets Journal Article Phys. Rev. B 110, 054416, 2024. @article{hemmida_role_2024, |
Impressions from past events
The research programme
We seek to design and utilize new quantum states by taking advantage of the recently developed capability to tailor electron systems in complex materials through a variety of complementary constraints, focusing on spin-momentum locking, gauge structures of interacting spin systems, and kinetic constraints.
News
Here you can find all the important news around the project ConQuMat: recent publication, internal events for project members and opening for various positions.
Outreach - Öffentlichkeitsarbeit
Dive with us into the fascinating world of quantum matter! (science communication offers in German)
Es gibt viele Angebote, um die Forschung aus dem Projekt ConQuMat der Öffentlichkeit zugänglich zu machen. Egal ob durch einen Blog, Spiele oder Erlebnisveranstaltungen – tauchen Sie mit uns in die faszinierende Welt der Quantenmaterie ein!