Research Topics
We are doing research in a variety of topics in condensed matter theory, see the list below.
Correlated solid state systems with prominent quantum effects
- Quantum spin systems
- Strongly interacting electronic systems
- Inelastic scattering or absorption
- Binding phenomena
- Topologically non-trivial systems
Figure:
Mutually attracting spin waves in the square-lattice quantum antiferromagnet
M. Powalski, K.P. Schmidt, and G.S. Uhrig
SciPost Phys. 4, 001 (2018)
Further results:
- Three-body bound states in antiferromagnetic spin ladders
G. Schmiedinghoff, L. Müller, U. Kumar, G.S. Uhrig, and B. Fauseweh
Commun Phys 5, 218 (2022)
- Continuous similarity transformation for critical phenomena: Easy-axis antiferromagnetic XXZ model
M.R. Walther, D.-B. Hering, G.S. Uhrig, K.P. Schmidt
Phys. Rev. Research 5, 013132 (2023) - Quantitative description of long-range order in the spin−1/2 XXZ antiferromagnet on the square lattice
N. Caci, D.-B. Hering, M. R. Walther, K. P. Schmidt, S. Wessel, and G. S. Uhrig
Phys. Rev. B 110, 054411 (2024) - Quantum melting of long-range ordered quantum antiferromagnets investigated by momentum-space continuous similarity transformations
D.-B. Hering, M. R. Walther, K. P. Schmidt, and G. S. Uhrig
Phys. Rev. B 110, 085115 (2024) - Quantum effects in the magnon spectrum of 2D altermagnets via continuous similarity transformations
R. Wiedmann, D.-B. Hering, V. Sulaiman, M. R. Walther, K. P. Schmidt, G. S. Uhrig
arXiv:2511.03528 - Quantum decay of magnons in the unfrustrated honeycomb Heisenberg model
C. Krämer, D.-B. Hering, V. Sulaiman, M. R. Walther, G. S. Uhrig, K. P. Schmidt
arXiv:2512.19162
Non-equilibrium physics
- Quenched lattice systems
- Periodically pulsed and continuously driven systems
- Stroboscopic stationary states
- Ultrafast magnetism
Figure:
Dynamical properties of a driven dissipative dimerized S=1/2 chain
M. Yarmohammadi, C. Meyer, B. Fauseweh, B. Normand, and G.S. Uhrig
Phys. Rev. B 103, 045132 (2021)
Further results:
- Strong-coupling magnetophononics: Self-blocking, phonon-bitriplons, and spin-band engineering
M. Yarmohammadi, M. Krebs, G. S. Uhrig, and B. Normand
Phys. Rev. B 107, 174415 (2023) - Pulsed magnetophononics in gapped quantum magnets
B. Demazure, M. Krebs, G. S. Uhrig, and B. Normand
Phys. Rev. B 112, 075112 (2025)
Spin dynamic mean-field theory (spinDMFT) for nuclear magnetic resonance
- dynamic mean-fields for spin variables
- infinite and finite temperatures
- free induction decay and pulse protocols
- line shapes
- dipolar and quadrupolar interactions
Figure:
Simulating the interplay of dipolar and quadrupolar interactions in NMR by spin dynamic mean-field theory
T. Gräßer, G. S. Uhrig
arXiv:2507.17720
Further results
- Dynamic mean-field theory for dense spin systems at infinite temperature
T. Gräßer, P. Bleicker, D.-B. Hering, M. Yarmohammadi, and G.S. Uhrig
Phys. Rev. Research 3, 043168 (2021) - Understanding the dynamics of randomly positioned dipolar spin ensembles
T. Gräßer, K. Rezai, A. O. Sushkov, and G. S. Uhrig
Phys. Rev. Research 5, 043191 (2023) - Microscopic understanding of NMR signals by dynamic mean-field theory for spins
T. Gräßer, T. Hahn, G. S. Uhrig
Solid State Nuclear Magnetic Resonance 132, 101936 (2024) - Simulating the interplay of dipolar and quadrupolar interactions in NMR by spin dynamic mean-field theory
T. Gräßer, G. S. Uhrig
arXiv:2507.17720 - First-principles simulation of spin diffusion in static solids using dynamic mean-field theory
T. Gräßer, G. S. Uhrig, M. Ernst
arXiv:2512.15572
Manipulation of magnetic order parameters
- switching magnetic order
- time-dependent Schwinger boson mean-field theory
- constant and time-dependend control fields
- uniform and staggered control fields
- dephasing and relaxation
Figure:
Switching the Magnetization in Quantum Antiferromagnets
K. Bolsmann, A. Khudoyberdiev, and G. S. Uhrig
PRX Quantum 4, 030332 (2023)
Further results:
- Switching the Magnetization in Quantum Antiferromagnets
K. Bolsmann, A. Khudoyberdiev, and G. S. Uhrig
PRX Quantum 4, 030332 (2023) - Switching of magnetization in quantum antiferromagnets with time-dependent control fields
A. Khudoyberdiev, G. S. Uhrig
Phys. Rev. B 109, 174419 (2024) - Exchange-enhanced switching by alternating fields in quantum antiferromagnets
A. Khudoyberdiev, G. S. Uhrig
Phys. Rev. B 111, 064408 (2025) - The effect of dephasing and spin-lattice relaxation during the switching processes in quantum antiferromagnets
A. Khudoyberdiev, G. S. Uhrig
SciPost Phys. 19, 117 (2025) - Switching magnetization of quantum antiferromagnets: Schwinger boson mean-field theory compared to exact diagonalization
F. Johannesmann, A. Khudoyberdiev, G. S. Uhrig
arXiv:2601.04811