Pseudo-fermion functional renormalization group for spin models

T Müller, D Kiese, N Niggemann… - Reports on Progress …, 2024 - iopscience.iop.org
For decades, frustrated quantum magnets have been a seed for scientific progress and
innovation in condensed matter. As much as the numerical tools for low-dimensional …

Pinch-points to half-moons and up in the stars: The kagome skymap

D Kiese, F Ferrari, N Astrakhantsev, N Niggemann… - Physical Review …, 2023 - APS
Pinch point singularities, associated with flat band magnetic excitations, are tell-tale
signatures of Coulomb spin liquids. While their properties in the presence of quantum …

Quantum effects on unconventional pinch point singularities

N Niggemann, Y Iqbal, J Reuther - Physical Review Letters, 2023 - APS
Fracton phases are a particularly exotic type of quantum spin liquids where the elementary
quasiparticles are intrinsically immobile. These phases may be described by unconventional …

Phase diagram of a distorted kagome antiferromagnet and application to Y-kapellasite

M Hering, F Ferrari, A Razpopov, II Mazin… - npj Computational …, 2022 - nature.com
We investigate the magnetism of a previously unexplored distorted spin-1/2 kagome model
consisting of three symmetry-inequivalent nearest-neighbor antiferromagnetic Heisenberg …

[HTML][HTML] TMDs as a platform for spin liquid physics: A strong coupling study of twisted bilayer WSe2

D Kiese, Y He, C Hickey, A Rubio, DM Kennes - APL Materials, 2022 - pubs.aip.org
The advent of twisted moiré heterostructures as a playground for strongly correlated electron
physics has led to a plethora of experimental and theoretical efforts seeking to unravel the …

Real-frequency quantum field theory applied to the single-impurity Anderson model

A Ge, N Ritz, E Walter, S Aguirre, J von Delft, FB Kugler - Physical Review B, 2024 - APS
A major challenge in the field of correlated electrons is the computation of dynamical
correlation functions. For comparisons with experiment, one is interested in their real …

Rise and fall of plaquette order in the Shastry-Sutherland magnet revealed by pseudofermion functional renormalization group

A Keleş, E Zhao - Physical Review B, 2022 - APS
The Shastry-Sutherland (SS) model as a canonical example of frustrated magnetism has
been extensively studied. The conventional wisdom has been that the transition from the …

Dimerization tendencies of the pyrochlore Heisenberg antiferromagnet: A functional renormalization group perspective

M Hering, V Noculak, F Ferrari, Y Iqbal, J Reuther - Physical Review B, 2022 - APS
We investigate the ground-state properties of the spin-1/2 pyrochlore Heisenberg
antiferromagnet using pseudofermion functional renormalization group techniques. The first …

Functional renormalization group study of the Kitaev- model on the honeycomb lattice and emergent incommensurate magnetic correlations

FL Buessen, YB Kim - Physical Review B, 2021 - APS
The theoretical inception of the Kitaev honeycomb model has had defining influence on the
experimental hunt for quantum spin liquids, bringing unprecedented focus onto the …

Ground-state phase diagram of spin- Kitaev-Heisenberg models

K Fukui, Y Kato, J Nasu, Y Motome - Physical Review B, 2022 - APS
The Kitaev model, whose ground state is a quantum spin liquid (QSL), was originally
conceived for spin S= 1/2 moments on a honeycomb lattice. In recent years, the model has …