63 citations · 156 across the 20 of their papers we have counts for
21 papers
Heavy-fermion hybridization waves from Dirac spinons near a Kondo-breakdown quantum phase transition
Pedro M. Cônsoli, Matthias Vojta, Onur Erten
Motivated by the recent observation of spatially modulated screening in different paramagnetic heavy-fermion materials, we propose a theoretical mechanism for the emergence of such…
Quantum spin-glass criticality in disordered frustrated dimer magnets
Darshan G. Joshi, Matthias Vojta
We study quantum phase transitions of Mott insulators between spin-glass and featureless paramagnetic phases. Specifically, we consider a triangular-lattice bilayer Heisenberg mode…
Unveiling Magnetic Frustration via the Elastocaloric Effect
Eric C. Andrade, Pedro M. Cônsoli, Matthias Vojta
Motivated by experimental progress in pressure and strain tuning of quantum materials, we examine the thermodynamic response of frustrated magnets to uniaxial strain. Specifically,…
Field-driven phases in a three-dimensional twisted Kitaev model for CoNbO: Interplay of frustration and spin-orbit coupling
Tom Drechsler, Matthias Vojta
The Ising chain in a transverse field stands out as a paradigmatic example for a quantum phase transition. CoNbO has been discussed as a material realization of this physic…
Quantum Coulomb Liquids of Different Rank in the Breathing Pyrochlore Antiferromagnet
Lasse Gresista, Daniel Lozano-Gómez, Matthias Vojta +2
Emergent gauge fields and Coulomb liquids have long been central to the physics of frustrated pyrochlore magnets, yet their realization beyond conventional, i.e. rank-1 , spi…
Classical spin liquids from frustrated Ising models in hyperbolic space
Fabian Köhler, Johanna Erdmenger, Roderich Moessner +1
Antiferromagnetic Ising models on frustrated lattices can realize classical spin liquids, with highly degenerate ground states and, possibly, fractionalized excitations and emergen…
Fragility of local moments against hybridization with flat bands
Max Fischer, Arianna Poli, Lorenzo Crippa +5
The Kondo screening of a localized magnetic moment crucially depends on the spectral properties of the electronic bath to which it is coupled. Unlike textbook examples, realistic s…
Quantum effects on pyrochlore higher-rank U(1) spin liquids: Pinch-line singularities, spin nematics, and connections to oxide materials
Lasse Gresista, Daniel Lozano-Gómez, Matthias Vojta +2
Motivated by the magnetism of pyrochlore oxides, we consider the effect of quantum fluctuations in the most general symmetry-allowed nearest-neighbor Kramers exchange Hamiltonian o…
Fractionalized Superconductivity Mediated by Majorana Fermions in the Kitaev-Kondo Lattice
Matthew Bunney, Urban F. P. Seifert, Stephan Rachel +1
Superconductivity usually emerges from a metallic normal state which follows the Fermi-liquid paradigm. If, in contrast, the normal state is a fractionalized non-Fermi liquid, then…
Bond disorder in extended Heisenberg-Kitaev models: Spin textures and in-gap states in the high-field regime
Georgia Fragkopoulou, Matthias Vojta
We study the effect of bond disorder in extended Heisenberg-Kitaev models on the honeycomb lattice, relevant for materials such as -RuCl, in the semiclassical limit using a…
Discrete JT gravity as an Ising model
Johanna Erdmenger, Jonathan Karl, Yanick Thurn +2
Inspired by the program of discrete holography, we show that Jackiw-Teitelboim (JT) gravity on a hyperbolic tiling of Euclidean AdS gives rise to an Ising model on the dual lat…
Critical properties of metallic and deconfined quantum phase transitions in Dirac systems
Zi Hong Liu, Matthias Vojta, Fakher F. Assaad +1
We characterize, by means of large-scale fermion quantum Monte Carlo simulations, metallic and deconfined quantum phase transitions in a bilayer honeycomb model in terms of their q…
A Classical Chiral Spin-Liquid from Chiral Interactions on the Pyrochlore Lattice
Daniel Lozano-Gómez, Yasir Iqbal, Matthias Vojta
Classical spin-liquids are paramagnetic phases which feature nontrivial patterns of spin correlations within their ground-state manifold whose degeneracy scales with system size. O…
SU() altermagnetism: Lattice models, magnon modes, and flavor-split bands
Pedro M. Cônsoli, Matthias Vojta
Altermagnetism, a type of magnetic order that combines properties of ferro- and antiferromagnets, has stirred great interest lately not only as a promising source of spintronics ap…
Field-driven transition from quantum spin liquid to magnetic order in triangular-lattice antiferromagnets
Santanu Dey, Joseph Maciejko, Matthias Vojta
Recently several triangular-lattice magnets with delafossite structure have been found to display spin-liquid behavior down to the lowest temperatures. Remarkably, applying a magne…
Kondo screening in a Majorana metal
S. Lee, Y. S. Choi, S. -H. Do +8
Kondo impurities provide a nontrivial probe to unravel the character of the excitations of a quantum spin liquid. In the S=1/2 Kitaev model on the honeycomb lattice, Kondo impuriti…
Emergent Chiral Metal near a Kondo Breakdown Quantum Phase Transition
Tom Drechsler, Matthias Vojta
The destruction of the Kondo effect in a local-moment metal can lead to a topological non-Fermi-liquid phase, dubbed fractionalized Fermi liquid, with spinon-type excitations and a…
Field-induced intermediate phase in -RuCl: Non-coplanar order, phase diagram, and proximate spin liquid
P. Lampen-Kelley, L. Janssen, E. C. Andrade +6
Frustrated magnets with strong spin-orbit coupling promise to host topological states of matter, with fractionalized excitations and emergent gauge fields. Kitaev's proposal for a…
Spin freezing in the disordered pyrochlore magnet NaCaCoF: NMR studies and Monte-Carlo simulations
R. Sarkar, J. W. Krizan, F. Brückner +5
We present results of Na and F nuclear magnetic resonance (NMR) measurements on NaCaCoF, a frustrated pyrochlore magnet with a Curie-Weiss temperature, $T_{cw…
Dynamical structure factors and excitation modes of the bilayer Heisenberg model
M. Lohöfer, T. Coletta, D. G. Joshi +4
Using quantum Monte Carlo simulations along with higher-order spin-wave theory, bond-operator and strong-coupling expansions, we analyse the dynamical spin structure factor of the…
Defect-induced spin-glass magnetism in incommensurate spin-gap magnets
Eric C. Andrade, Matthias Vojta
We study magnetic order induced by non-magnetic impurities in quantum paramagnets with incommensurate host spin correlations. In contrast to the well-studied commensurate case wher…