Multiscale space-time ansatz for correlation functions of quantum systems based on quantics tensor trains

H Shinaoka, M Wallerberger, Y Murakami, K Nogaki… - Physical Review X, 2023 - APS
The correlation functions of quantum systems—central objects in quantum field theories—
are defined in high-dimensional space-time domains. Their numerical treatment thus suffers …

Larmor precession in strongly correlated itinerant electron systems

EGCP van Loon, HUR Strand - Communications Physics, 2023 - nature.com
Many-electron systems undergo a collective Larmor precession in the presence of a
magnetic field. In a paramagnetic metal, the resulting spin wave provides insight into the …

Long-term memory magnetic correlations in the Hubbard model: A dynamical mean-field theory analysis

C Watzenböck, M Fellinger, K Held, A Toschi - SciPost Physics, 2022 - scipost.org
We investigate the onset of a not-decaying asymptotic behavior of temporal magnetic
correlations in the Hubbard model in infinite dimensions. This long-term memory feature of …

Thermal squeezing and nonlinear spectral shift of magnons in antiferromagnetic insulators

M Shiranzaei, RE Troncoso, J Fransson… - New Journal of …, 2022 - iopscience.iop.org
We investigate the effect of magnon–magnon interactions on the dispersion and polarization
of magnon modes in collinear antiferromagnetic (AF) insulators at finite temperatures. In two …

Hidden covalent insulator and spin excitations in

D Csontosová, J Chaloupka, H Shinaoka, A Hariki… - Physical Review B, 2023 - APS
The density functional plus dynamical mean-field theory is used to study the spin excitation
spectra of SrRu 2 O 6. A good quantitative agreement with experimental spin excitation …

Vertex corrections in strongly correlated electron systems: timescales of the spin and charge response

C Watzenböck - 2022 - repositum.tuwien.at
Strongly correlated electron systems show some of the most intriguing phenomena in
condensed matter physics. They range from high-temperature superconductivity in cuprates …