Exploration of doped quantum magnets with ultracold atoms

A Bohrdt, L Homeier, C Reinmoser, E Demler, F Grusdt - Annals of Physics, 2021 - Elsevier
In the last decade, quantum simulators, and in particular cold atoms in optical lattices, have
emerged as a valuable tool to study strongly correlated quantum matter. These experiments …

High-temperature kinetic magnetism in triangular lattices

I Morera, M Kanász-Nagy, T Smolenski, L Ciorciaro… - Physical Review …, 2023 - APS
We study kinetic magnetism for the Fermi-Hubbard model in triangular lattices. We focus on
the regime of strong interactions, U≫ t, and filling factors around one electron per site. For …

Parton theory of magnetic polarons: Mesonic resonances and signatures in dynamics

F Grusdt, M Kanasz-Nagy, A Bohrdt, CS Chiu, G Ji… - Physical Review X, 2018 - APS
When a mobile hole is moving in an antiferromagnet it distorts the surrounding Néel order
and forms a magnetic polaron. Such interplay between hole motion and antiferromagnetism …

Coupling a mobile hole to an antiferromagnetic spin background: Transient dynamics of a magnetic polaron

G Ji, M Xu, LH Kendrick, CS Chiu, JC Brüggenjürgen… - Physical Review X, 2021 - APS
Understanding the interplay between charge and spin and its effects on transport is a
ubiquitous challenge in quantum many-body systems. In the Fermi-Hubbard model, this …

Nonequilibrium hole dynamics in antiferromagnets: damped strings and polarons

KK Nielsen, T Pohl, GM Bruun - Physical Review Letters, 2022 - APS
We develop a nonperturbative theory for hole dynamics in antiferromagnetic spin lattices, as
described by the tJ model. This is achieved by generalizing the self-consistent Born …

Single-hole spectra of Kitaev spin liquids: from dynamical Nagaoka ferromagnetism to spin-hole fractionalization

W Kadow, HK Jin, J Knolle, M Knap - npj Quantum Materials, 2024 - nature.com
The dynamical response of a quantum spin liquid upon injecting a hole is a pertinent open
question. In experiments, the hole spectral function, measured momentum-resolved in angle …

Dynamical formation of a magnetic polaron in a two-dimensional quantum antiferromagnet

A Bohrdt, F Grusdt, M Knap - New Journal of Physics, 2020 - iopscience.iop.org
Tremendous recent progress in the quantum simulation of the Hubbard model paves the
way to controllably study doped antiferromagnetic Mott insulators. Motivated by these …

Exact nonequilibrium hole dynamics, magnetic polarons, and string excitations in antiferromagnetic Bethe lattices

KK Nielsen - Physical Review B, 2022 - APS
We investigate a rare instance of an exactly solvable nonequilibrium many-body problem. In
particular, we derive an exact solution for the nonequilibrium dynamics of an initially …

Thermally induced localization of dopants in a magnetic spin ladder

KK Nielsen - Physical Review Research, 2024 - APS
I unveil an emergent localization phenomenon pertaining to the motion of a dopant in a
thermal spin lattice. This is rendered localized by thermal spin fluctuations, whereby it is in …

Quantum correlations at infinite temperature: The dynamical nagaoka effect

M Kanász-Nagy, I Lovas, F Grusdt, D Greif, M Greiner… - Physical Review B, 2017 - APS
Do quantum correlations play a role in high-temperature dynamics of many-body systems?
A common expectation is that thermal fluctuations lead to fast decoherence and make …