839 citations · 5.7k across the 74 of their papers we have counts for
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A continuous confinement-deconfinement transition in a triangular quantum magnet
Suguru Hosoi, Sejun Park, Michihiro Hirata +13
A continuous transition between phases hosting distinct excitations---bosonic magnons versus fermionic spinons---is a long-sought phenomenon in quantum magnetism, analogous to the…
Intermediate Field Spin(on) Dynamics in -RuCl
C. L. Sarkis, K. D. Dixit, P. Rao +11
We present comprehensive inelastic neutron spectroscopic maps of the magnetic field-induced disordered phase of the Kitaev quantum spin liquid candidate material -RuCl. For…
Spin-lattice coupling induced chiral phonons and their signature in Raman Circular Dichroism
Eduard Koller, Swetlana Swarup, Johannes Knolle +1
Recent Raman experiments on the Kitaev material -RuCl have reported a finite Raman circular dichroism (RCD), revealing chiral phonon behaviour not expected from lattice symm…
Quantum critical dynamical response of the twisted Kitaev spin chain
Uliana E. Khodaeva, Dmitry L. Kovrizhin, Johannes Knolle
The dynamical structure factor of the transverse field Ising model (TFIM) shows universal power-law divergence at its quantum critical point, signatures of which have been arguably…
Projectively implemented altermagnetism in an exactly solvable quantum spin liquid
Avedis Neehus, Achim Rosch, Johannes Knolle +1
Altermagnets are a new class of symmetry-compensated magnets with large spin splittings. Here, we show that the notion of altermagnetism extends beyond the realm of Landau-type ord…
Finite Spinon Density-of-States in Triangular-Lattice Delafossite TlYbSe
Bishnu P. Belbase, Arjun Unnikrishnan, Shi Feng +3
We introduce the rare-earth delafossite compound TlYbSe -- extending the search for quantum spin liquids in frustrated triangular lattice magnets. While the DC magnetisation su…
Raman Circular Dichroism and Quantum Geometry of Chiral Quantum Spin Liquids
Eduard Koller, Valentin Leeb, Natalia B. Perkins +1
We show that the quantum geometry of fractionalized spin excitations in Mott-insulating quantum spin liquids (QSL) gives rise to a finite Raman circular dichroism (RCD) signal. We…
Dynamics and stability of U(1) spin liquids beyond mean-field theory: Triangular-lattice - Heisenberg model
Josef Willsher, Johannes Knolle
Quantum spin liquids (QSLs) are long-range entangled phases of frustrated magnets exhibiting fractionalised spin excitations. In two dimensions, there is limited analytical underst…
Dynamical response theory of interacting Majorana fermions and its application to generic Kitaev quantum spin liquids in a field
Peng Rao, Roderich Moessner, Johannes Knolle
Motivated by the appearance of Majorana fermions in a broad range of correlated and topological electronic systems, we develop a general method to compute the dynamical response of…
Theory of Nonlinear Spectroscopy of Quantum Magnets
Anubhav Srivastava, Stefan Birnkammer, GiBaik Sim +2
Two-dimensional coherent spectroscopy (2DCS) is an established method for characterizing molecules and has been proposed in the THz regime as a new tool for probing exotic excitati…
Stability of algebraic spin liquids coupled to quantum phonons
Francesco Ferrari, Josef Willsher, Urban F. P. Seifert +2
Algebraic spin liquids are quantum disordered phases of insulating magnets which exhibit fractionalized gapless excitations and power-law correlations. Quantum spin liquids in this…
Spin-Peierls instability of deconfined quantum critical points
David Hofmeier, Josef Willsher, Urban F. P. Seifert +1
Deconfined quantum critical points (DQCPs) are putative phase transitions beyond the Landau paradigm with emergent fractionalized degrees of freedom. The original example of a DQCP…
Spin-Peierls instability of the U(1) Dirac spin liquid
Urban F. P. Seifert, Josef Willsher, Markus Drescher +2
A complicating factor in the realization and observation of quantum spin liquids in materials is the ubiquitous presence of other degrees of freedom, in particular lattice distorti…
Shedding Light on Microscopic Details: 2D Spectroscopy of 1D Quantum Ising Magnets
GiBaik Sim, Frank Pollmann, Johannes Knolle
The identification of microscopic models describing the low-energy properties of correlated materials has been a central goal of spectroscopic measurements. We demonstrate how 2D n…
Magnetic excitations, phase diagram and order-by-disorder in the extended triangular-lattice Hubbard model
Josef Willsher, Hui-Ke Jin, Johannes Knolle
The dynamical structure factor is an important observable of quantum magnets but due to numerical and theoretical limitations, it remains a challenge to make predictions for Hubbar…
Nonlinear spectroscopy of bound states in perturbed Ising spin chains
GiBaik Sim, Johannes Knolle, Frank Pollmann
We study the nonlinear response of non-integrable 1D spin models using infinite matrix-product state techniques. As a benchmark and demonstration of the method, we first calculate…
Optical phonons coupled to a Kitaev spin liquid
A. Metavitsiadis, W. Natori, J. Knolle +1
Emergent excitation continua in frustrated magnets are a fingerprint of fractionalization, characteristic of quantum spin-liquid states. Recent evidence from Raman scattering for a…
Gapless state of interacting Majorana fermions in a strain-induced Landau level
Adhip Agarwala, Subhro Bhattacharjee, Johannes Knolle +1
Mechanical strain can generate a pseudo-magnetic field, and hence Landau levels (LL), for low energy excitations of quantum matter in two dimensions. We study the collective state…
Vacancy-induced low-energy density of states in the Kitaev spin liquid
Wen-Han Kao, Johannes Knolle, Gábor B. Halász +2
The Kitaev honeycomb model has attracted significant attention due to its exactly solvable spin-liquid ground state with fractionalized Majorana excitations and its possible materi…
The range of non-Kitaev terms and fractional particles in RuCl
Yiping Wang, Gavin B. Osterhoudt, Yao Tian +12
Significant efforts have focused on the magnetic excitations of relativistic Mott insulators, predicted to realize the Kitaev quantum spin liquid (QSL). This exactly solvable model…
Disorder-free localization in a simple lattice gauge theory
Irene Papaefstathiou, Adam Smith, Johannes Knolle
Localization due to the presence of disorder has proven crucial for our current understanding of relaxation in isolated quantum systems. The many-body localized phase constitutes a…
Dynamics of a two-dimensional quantum spin-orbital liquid: spectroscopic signatures of fermionic magnons
Willian M. H. Natori, Johannes Knolle
We provide an exact study of dynamical correlations for the quantum spin-orbital liquid phases of an SU(2)-symmetric Kitaev honeycomb lattice model. We show that the spin dynamics…
Orbital Magnetic Field Effects in Mott Insulators with Strong Spin-Orbit Coupling
Willian M. H. Natori, Roderich Moessner, Johannes Knolle
We study the effect of a magnetic field on the low energy description of Mott insulators with strong spin-orbit (SO) coupling. In contrast to the standard case of the Hubbard model…
Logarithmic spreading of out-of-time-ordered correlators without many-body localization
Adam Smith, Johannes Knolle, Roderich Moessner +1
Out-of-time-ordered correlators (OTOCs) describe information scrambling under unitary time evolution, and provide a useful probe of the emergence of quantum chaos. Here we calculat…