Publications (162)
Probing spin correlations using angle resolved photoemission in a coupled metallic/Mott insulator system
V. Sunko, F. Mazzola, S. Kitamura +16
A nearly free electron metal and a Mott insulating state can be thought of as opposite ends of possibilities for the motion of electrons in a solid. In the magnetic oxide metal PdC…
A fractionalised "" classical Heisenberg spin liquid
J. Rehn, Arnab Sen, R. Moessner
Quantum spin systems are by now known to exhibit a large number of different classes of spin liquid phases. By contrast, for \textit{classical} Heisenberg models, only one kind of…
Neutron Scattering Signatures of Magnon Weyl Points
S. Shivam, R. Coldea, R. Moessner +1
We study the inelastic neutron scattering cross section in the vicinity of touching points in magnon bands. Among the possible touching points are magnon Weyl points in three dimen…
Intrinsic and extrinsic nonstationary field-driven processes in the spin-ice compound Dy2Ti2O7
S. Erfanifam, S. Zherlitsyn, J. Wosnitza +4
Nonequilibrium processes are probed by ultrasound waves in the spin-ice material Dy2Ti2O7 at low temperatures. The sound velocity and the sound attenuation exhibit a number of anom…
From exotic phases to microscopic Hamiltonians
R. Moessner, K. S. Raman, S. L. Sondhi
We report recent analytical progress in the quest for spin models realising exotic phases. We focus on the question of `reverse-engineering' a local, SU(2) invariant S=1/2 Hamilton…
Analysis of a fully packed loop model arising in a magnetic Coulomb phase
L. D. C. Jaubert, M. Haque, R. Moessner
The Coulomb phase of spin ice, and indeed the Ic phase of water ice, naturally realise a fully-packed two-colour loop model in three dimensions. We present a detailed analysis of t…
Topological Electrostatics
B. Douçot, R. Moessner, D. L. Kovrizhin
We present a theory of optimal topological textures in nonlinear sigma-models with degrees of freedom living in the Grassmannian manifold. These textures describ…
Doping a topological quantum spin liquid: slow holes in the Kitaev honeycomb model
Gábor B. Halász, J. T. Chalker, R. Moessner
We present a controlled microscopic study of mobile holes in the spatially anisotropic (Abelian) gapped phase of the Kitaev honeycomb model. We address the properties of (i) a sing…
Magnetic susceptibility of diluted pyrochlore and SCGO antiferromagnets
R. Moessner, A. J. Berlinsky
We investigate the magnetic susceptibility of the classical Heisenberg antiferromagnet with nearest-neighbour interactions on the geometrically frustrated pyrochlore lattice, for a…
Properties of a classical spin liquid: the Heisenberg pyrochlore antiferromagnet
R. Moessner, J. T. Chalker
We study the low-temperature behaviour of the classical Heisenberg antiferromagnet with nearest neighbour interactions on the pyrochlore lattice. Because of geometrical frustration…
Ultrasonic investigations of spin-ices DyTiO and HoTiO in and out of equilibrium
S. Erfanifam, S. Zherlitsyn, S. Yasin +7
We report ultrasound studies of spin-lattice and single-ion effects in the spin-ice materials DyTiO (DTO) and HoTiO (HTO) across a broad field range up to 6…
Spin ice under pressure: symmetry enhancement and infinite order multicriticality
Ludovic D. C. Jaubert, J. T. Chalker, Peter C. W. Holdsworth +1
We study the low-temperature behaviour of spin ice when uniaxial pressure induces a tetragonal distortion. There is a phase transition between a Coulomb liquid and a fully magnetis…
Quasiparticle interference in iron-based superconductors
A. Akbari, J. Knolle, I. Eremin +1
We systematically calculate quasiparticle interference (QPI) signatures for the whole phase diagram of iron-based superconductors. Impurities inherent in the sample together with o…
Classical Dynamics of Harmonically Trapped Interacting Particles
Zhiyu Dong, R. Moessner, Masudul Haque
Motivated by current interest in the dynamics of trapped quantum gases, we study the microcanonical dynamics of a trapped one-dimensional gas of classical particles interacting via…
Acoustic signatures of the phases and phase transitions in YbTiO
Subhro Bhattacharjee, S. Erfanifam, E. L. Green +11
We report on measurements of the sound velocity and attenuation in a single crystal of the candidate quantum- spin-ice material YbTiO as a function of temperature and m…
Dipolar spin ice regime proximate to an all-in-all-out Néel ground state in the dipolar-octupolar pyrochlore CeSnO
D. R. Yahne, B. Placke, R. Schäfer +11
The dipolar-octupolar (DO) pyrochlores, RMO (R = Ce, Sm, Nd), are key players in the search for realizable novel quantum spin liquid (QSL) states as a large parameter s…
Semiclassical spin liquid state of easy axis Kagome antiferromagnets
Arnab Sen, Kedar Damle, R. Moessner
Motivated by recent experiments on Nd-langasite, we consider the effect of strong easy axis single-ion anisotropy on spins interacting with antiferromagnetic exchange…
Approximating random quantum optimization problems
B. Hsu, C. R. Laumann, A. Laeuchli +2
We report a cluster of results regarding the difficulty of finding approximate ground states to typical instances of the quantum satisfiability problem -QSAT on large random gra…
The Effect of Weak Lensing on the Angular Correlation Function of Faint Galaxies
R. Moessner, B. Jain, J. V. Villumsen
The angular correlation function \wth of faint galaxies is affected both by nonlinear gravitational evolution and by magnification bias due to gravitational lensing. We compute the…
Magnetic multipole analysis of kagome and artificial ice dipolar arrays
Gunnar Moller, R. Moessner
We analyse an array of linearly extended monodomain dipoles forming square and kagome lattices. We find that its phase diagram contains two (distinct) finite-entropy kagome ice reg…
A Three Dimensional Kasteleyn Transition: Spin Ice in a [100] Field
Ludovic D. C. Jaubert, J. T. Chalker, Peter C. W. Holdsworth +1
We examine the statistical mechanics of spin-ice materials with a [100] magnetic field. We show that the approach to saturated magnetisation is, in the low-temperature limit, an ex…
Site dilution in Kitaev's honeycomb model
A. J. Willans, J. T. Chalker, R. Moessner
We study the physical consequences of site dilution in Kitaev's honeycomb model, in both its gapped and gapless phases. We show that a vacancy binds a flux of the emergent ga…
Multicomponent Skyrmion lattices and their excitations
D. L. Kovrizhin, Benoît Douçot, R. Moessner
We study quantum Hall ferromagnets with a finite density topologically charged spin textures in the presence of internal degrees of freedom such as spin, valley, or layer indices,…
Slow holes in the triangular Ising antiferromagnet
R. Moessner, S. L. Sondhi
We consider the problem of the doped Ising antiferromagnet on the frustrated triangular lattice in the limit where the hole kinetic energy is much smaller than the Ising exchange.…
Nonequilibrium transport and statistics of Schwinger pair production in Weyl semimetals
Szabolcs Vajna, Balázs Dóra, R. Moessner
The non-equilibrium dynamics beyond linear response of Weyl semimetals is studied after a sudden switching on of a DC electric field. The resulting current is a nonmonotonic functi…
Expansions for nearly Gaussian distributions
S. Blinnikov, R. Moessner
Various types of expansions in series of Chebyshev-Hermite polynomials currently used in astrophysics for weakly non-normal distributions are compared, namely the Gram-Charlier, Ga…
Adiabaticity enhancement in the classical transverse field Ising chain, and its effective non-Hermitian description
B. Dóra, R. Moessner
We analyse the near-adiabatic dynamics in a ramp through the critical point (CP) of the classical transverse field Ising chain. This is motivated, conceptually, by the fact that th…
Kagome chiral spin liquid as a gauged U(1) symmetry protected topological phase
Yin-Chen He, Subhro Bhattacharjee, Frank Pollmann +1
While the existence of a chiral spin liquid (CSL) on a class of spin-1/2 kagome antiferromagnets is by now well-established numerically, a controlled theoretical path from the latt…
Zero point fluctuations for magnetic spirals and Skyrmions, and the fate of the Casimir energy in the continuum limit
B. Douçot, D. Kovrizhin, R. Moessner
We study the role of zero-point quantum fluctuations in a range of magnetic states which on the classical level are close to spin-aligned ferromagnets. These include Skyrmion textu…
Generic mixed columnar-plaquette phases in Rokhsar-Kivelson models
A. Ralko, D. Poilblanc, R. Moessner
We revisit the phase diagram of Rokhsar-Kivelson models, which are used in fields such as superconductivity, frustrated magnetism, cold bosons, and the physics of Josephson junctio…
Symmetry Breaking on the Three-Dimensional Hyperkagome Lattice of Na_4Ir_3O_8
E. J. Bergholtz, A. M. Laeuchli, R. Moessner
We study the antiferromagnetic spin-1/2 Heisenberg model on the highly frustrated, three-dimensional, hyperkagome lattice of Na_4Ir_3O_8 using a series expansion method. We propose…
Tomographic Imaging of Orbital Vortex Lines in Three-Dimensional Momentum Space
T. Figgemeier, M. Ãnzelmann, P. Eck +16
We report the experimental discovery of orbital vortex lines in the three-dimensional (3D) band structure of a topological semimetal. Combining linear and circular dichroism in sof…
Emergent moments and random singlet physics in a Majorana spin liquid
S. Sanyal, K. Damle, J. T. Chalker +1
We exhibit an exactly solvable example of a SU(2) symmetric Majorana spin liquid phase, in which quenched disorder leads to random-singlet phenomenology. More precisely, we argue t…
Switching the Anomalous DC Response of an AC-driven Quantum Many-body system
Arnab Das, R. Moessner
For a class of integrable quantum many-body systems, symmetric AC driving can generically produce a steady DC response. We show how such dynamical freezing can be switched off, not…
Spin Ice, Fractionalization and Topological Order
C. Castelnovo, R. Moessner, S. L. Sondhi
The spin ice compounds {\dys} and {\holm} are highly unusual magnets which epitomize a set of concepts of great interest in modern condensed matter physics: their low-energy physic…
The phase diagram of the hexagonal lattice quantum dimer model
R. Moessner, S. L. Sondhi, P. Chandra
We discuss the phase diagram of the quantum dimer model on the hexagonal (honeycomb) lattice. In addition to the columnar and staggered valence bond solids which have been discusse…
The landscape of symmetry enhancement in tight-binding models
A. K. Dagnino, A. Corticelli, M. Gohlke +3
Band structures are ubiquitous in condensed matter physics and their symmetries constrain possible degeneracies, topology and response functions across a broad range of different s…
Quantum dimer models
R. Moessner, K. S. Raman
These lecture notes aim to provide a self-contained, pedagogical introduction to the physics of local constraints, fractionalisation and topological liquids organised around the Ro…
Quantum annealing: the fastest route to quantum computation?
C. R. Laumann, R. Moessner, A. Scardicchio +1
In this review we consider the performance of the quantum adiabatic algorithm for the solution of decision problems. We divide the possible failure mechanisms into two sets: small…
Bosonic Integer Quantum Hall effect in an interacting lattice model
Yin-Chen He, Subhro Bhattacharjee, R. Moessner +1
We study a bosonic model with correlated hopping on a honeycomb lattice, and show that its ground state is a bosonic integer quantum Hall (BIQH) phase, a prominent example of a sym…
An RVB phase in the triangular lattice quantum dimer model
R. Moessner, S. L. Sondhi
We study the quantum dimer model on the triangular lattice, which is expected to describe the singlet dynamics of frustrated Heisenberg models in phases where valence bond configur…
Observation of Dipolar Spin-ice--like Correlations in the Quantum Spin Ice Candidate CeSnO
Bo Yuan, M. Powell, X. Liu +9
Ce-pyrochlores, CeXO (X = Sn, Hf, Zr), have gained much recent attention as new quantum spin ice (QSI) ground state candidates. Although the nearest-neighbor (NN) XYZ m…
Phase transitions and random quantum satisfiability
C. R. Laumann, R. Moessner, A. Scardicchio +1
Alongside the effort underway to build quantum computers, it is important to better understand which classes of problems they will find easy and which others even they will find in…
Frustrated magnetism and resonating valence bond physics in two-dimensional kagome-like magnets
I. Rousochatzakis, R. Moessner, J. van den Brink
We explore the phase diagram and the low-energy physics of three Heisenberg antiferromagnets which, like the kagome lattice, are networks of corner-sharing triangles but contain tw…
Raman Scattering Signatures of Kitaev Spin Liquids in A IrO Iridates
J. Knolle, Gia-Wei Chern, D. L. Kovrizhin +2
We study theoretically the Raman scattering response in the gapless quantum spin liquid phase of the Kitaev-Heisenberg model. The dominant polarization-independent contribu…
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…
Hierarchy of fractional Chern insulators and competing compressible states
A. M. Läuchli, Z. Liu, E. J. Bergholtz +1
We study the phase diagram of interacting electrons in a dispersionless Chern band as a function of their filling. We find hierarchy multiplets of incompressible states at fillings…
Quantum order by disorder and accidental soft mode Er2Ti2O7
M. E. Zhitomirsky, M. V. Gvozdikova, P. C. W. Holdsworth +1
Motivated by recent neutron scattering experiments, we derive and study an effective "pseudo-dipolar" spin-1/2 model for the XY pyrochlore antiferromagnet Er2Ti2O7. While a bond-de…
Low-temperature properties of the Hubbard model on highly frustrated one-dimensional lattices
O. Derzhko, J. Richter, A. Honecker +2
We consider the repulsive Hubbard model on three highly frustrated one-dimensional lattices -- sawtooth chain and two kagomé chains -- with completely dispersionless (flat) lowest…
SU(2)-invariant spin-1/2 Hamiltonians with RVB and other valence bond phases
K. S. Raman, R. Moessner, S. L. Sondhi
We construct a family of rotationally invariant, local, S=1/2 Klein Hamiltonians on various lattices that exhibit ground state manifolds spanned by nearest-neighbor valence bond st…
A Bionic Coulomb Phase on the Pyrochlore Lattice
V. Khemani, R. Moessner, S. A. Parameswaran +1
A class of three dimensional classical lattice systems with macroscopic ground state degeneracies, most famously the spin ice system, are known to exhibit "Coulomb" phases wherein…
Theory of the [111] magnetization plateau in spin ice
R. Moessner, S. L. Sondhi
The application of a magnetic field along the [111] direction in the spin ice compounds leads to two magnetization plateaux, in the first of which the ground state entropy is reduc…
Early Objects in the Cosmic String Theory with Hot Dark Matter
R. Moessner, R. Brandenberger
We study the accretion of hot dark matter onto moving cosmic string loops, using an adaptation of the Zeldovich approximation to HDM. We show that a large number of nonlinear objec…
Formation of High Redshift Objects in a Cosmic String Theory with Hot Dark Matter
R. Moessner, R. Brandenberger
Using a modification of the Zel'dovich approximation adapted to hot dark matter, the accretion of such matter onto moving cosmic string loops is studied. It is shown that a large n…
Theory of itinerant magnetic excitations in the SDW phase of iron-based superconductors
J. Knolle, I. Eremin, A. V. Chubukov +1
We argue that salient experimental features of the magnetic excitations in the SDW phase of iron-based superconductors can be understood within an itinerant model. We identify a mi…
Short-ranged RVB physics, quantum dimer models and Ising gauge theories
R. Moessner, S. L. Sondhi, Eduardo Fradkin
Quantum dimer models are believed to capture the essential physics of antiferromagnetic phases dominated by short-ranged valence bond configurations. We show that these models aris…
The quantum adiabatic algorithm and scaling of gaps at first order quantum phase transitions
C. R. Laumann, R. Moessner, A. Scardicchio +1
Motivated by the quantum adiabatic algorithm (QAA), we consider the scaling of the Hamiltonian gap at quantum first order transitions, generally expected to be exponentially small…
Unconventional magnetization processes and thermal runaway in spin-ice DyTiO
D. Slobinsky, C. Castelnovo, R. A. Borzi +4
We investigate the non-equilibrium behavior of the spin-ice material DyTiO by studying its magnetization as a function of the rate at which an external field is swept.…
Inhomogeneous quantum antiferromagnetism on periodic lattices
A. Jagannathan, R. Moessner, S. Wessel
We study quantum antiferromagnets on two-dimensional bipartite lattices. We focus on local variations in the properties of the ordered phase which arise due to the presence of ineq…
On bipartite Rokhsar-Kivelson points and Cantor deconfinement
Eduardo Fradkin, David A. Huse, R. Moessner +2
Quantum dimer models on bipartite lattices exhibit Rokhsar-Kivelson (RK) points with exactly known critical ground states and deconfined spinons. We examine generic, weak, perturba…
Quantum spin liquid at finite temperature: proximate dynamics and persistent typicality
I. Rousochatzakis, S. Kourtis, J. Knolle +2
Quantum spin liquids are long-range entangled states of matter with emergent gauge fields and fractionalized excitations. While candidate materials, such as the Kitaev honeycomb ru…
Clustering in Hilbert space of a quantum optimization problem
S. C. Morampudi, B. Hsu, S. L. Sondhi +2
The solution space of many classical optimization problems breaks up into clusters which are extensively distant from one another in the Hamming metric. Here, we show that an analo…
Quantum Spin Ice Response to a Magnetic Field in the Dipole-Octupole Pyrochlore CeZrO
E. M. Smith, J. Dudemaine, B. Placke +17
We report new heat capacity measurements on single crystal CeZrO down to 0.1 K in a magnetic field along the direction. These new measurements s…
Excitations in the field-induced quantum spin liquid state of alpha-RuCl3
A. Banerjee, P. Lampen-Kelley, J. Knolle +14
The Kitaev model on a honeycomb lattice predicts a paradigmatic quantum spin liquid (QSL) exhibiting Majorana Fermion excitations. The insight that Kitaev physics might be realized…
Analytical theory for proton correlations in common water ice
S. V. Isakov, R. Moessner, S. L. Sondhi +1
We provide a fully analytical microscopic theory for the proton correlations in water ice . We compute the full diffuse elastic neutron scattering structure factor, which we f…
Coulomb phase diagnostics as function of temperature, interaction range and disorder
Arnab Sen, R. Moessner, S. L. Sondhi
The emergent gauge field characteristic of the Coulomb phase of spin ice betrays its existence via pinch points in the spin structure factor in reciprocal space which t…
A topological spin glass in diluted spin ice
Arnab Sen, R. Moessner
It is a salient experimental fact that a large fraction of candidate spin liquid materials freeze as the temperature is lowered. The question naturally arises whether such freezing…
Exact results for interacting electrons in high Landau levels
R. Moessner, J. T. Chalker
We study a two-dimensional electron system in a magnetic field with a fermion hardcore interaction and without disorder. Projecting the Hamiltonian onto the n-th Landau level, we s…
Two-dimensional periodic frustrated Ising models in a transverse field
R. Moessner, S. L. Sondhi, P. Chandra
We investigate the interplay of classical degeneracy and quantum dynamics in a range of periodic frustrated transverse field Ising systems at zero temperature. We find that such dy…
Single Crystal Diffuse Neutron Scattering Study of the Dipole-Octupole Quantum Spin Ice Candidate CeZrO: No Apparent Octupolar Correlations Above K
E. M. Smith, R. Schäfer, J. Dudemaine +8
The insulating magnetic pyrochlore CeZrO has gained attention as a quantum spin ice candidate with dipole-octupole character arising from the crystal electric field gro…
Neutron scattering signatures of the 3D hyper-honeycomb Kitaev quantum spin-liquid
A. Smith, J. Knolle, D. L. Kovrizhin +2
Motivated by recent synthesis of the hyper-honeycomb material -, we study the dynamical structure factor (DSF) of the corresponding 3D Kitaev quantum spin…
Two-Peak Heat Capacity Accounts for Entropy and Ground State Access in the Dipole-Octupole Pyrochlore CeHfO
E. M. Smith, A. Fitterman, R. Schäfer +18
Magnetic heat capacity measurements of a high-quality single crystal of the dipole-octupole pyrochlore CeHfO down to a temperature of K are reported. These s…
Quasiparticle interference from different impurities on the surface of pyrochlore iridates: signatures of the Weyl phase
F. Lambert, A. P. Schnyder, R. Moessner +1
Weyl semimetals are gapless three-dimensional topological materials where two bands touch at an even number of points in the bulk Brillouin zone. These semimetals exhibit topologic…
Frustrated Order by Disorder: the Pyrochlore Antiferromagnet with Bond Disorder
L. Bellier-Castella, M. J. P. Gingras, P. C. W. Holdsworth +1
The classical Heisenberg antiferromagnet on the pyrochlore lattice is macroscopically and continuously degenerate and the system remains disordered at all temperatures, even in the…
Magnets with strong geometric frustration
R. Moessner
A non-technical introduction to the theory of magnets with strong geometric frustration is given, concentrating on magnets on corner-sharing (kagome, pyrochlore, SCGO and GGG) latt…
Three dimensional resonating valence bond liquids and their excitations
R. Moessner, S. L. Sondhi
We show that there are two types of RVB liquid phases present in three-dimensional quantum dimer models, corresponding to the deconfining phases of U(1) and Z_2 gauge theories in d…
Magnetic resonance from the interplay of frustration and superconductivity
J. Knolle, I. Eremin, J. Schmalian +1
Motivated by the iron-based superconductors, we develop a self-consistent electronic theory for the itinerant spin excitations in the regime of coexistence of the antiferromagnetic…
Mixed Columnar-Plaquette Crystal of correlated fermions on the 2D pyrochlore lattice at fractional filling
F. Trousselet, D. Poilblanc, R. Moessner
We study a model of strongly correlated S=1/2 fermions on the planar pyrochlore, or checkerboard, lattice, at fractional (1/8) filling. Starting with the extended Hubbard model in…
Pocket Monte Carlo algorithm for classical doped dimer models
Werner Krauth, R. Moessner
We study the correlations of classical hardcore dimer models doped with monomers by Monte Carlo simulation. We introduce an efficient cluster algorithm, which is applicable in any…
Incommensurate magnetic fluctuations and Fermi surface topology in LiFeAs
J. Knolle, V. B. Zabolotnyy, I. Eremin +12
Using the angle-resolved photoemission spectroscopy (ARPES) data accumulated over the whole Brillouin zone (BZ) in LiFeAs we analyze the itinerant component of the dynamic spin sus…
Valence-bond crystal in a {111} slice of the pyrochlore antiferromagnet
Oleg Tchernyshyov, Hong Yao, R. Moessner
We investigate theoretically the ordering effect of quantum spin fluctuations in a Heisenberg antiferromagnet on a two-dimensional network of corner sharing tetrahedra. This networ…
Ising models of quantum frustration
R. Moessner, S. L. Sondhi
We report on a systematic study of two dimensional, periodic, frustrated Ising models with a quantum dynamics introduced via a transverse magnetic field. The systems studied are th…
A field trip through spin ice
G. Sala, C. Castelnovo, R. Moessner +5
Fractionalisation -- the breaking up of an apparently indivisible microscopic degree of freedom -- is one of the most counterintuitive phenomena in many-body physics. Here we study…
Order by distortion and string modes in pyrochlore antiferromagnet
O. Tchernyshyov, R. Moessner, S. L. Sondhi
We study the effects of magnetoelastic couplings on pyrochlore antiferromagnets. We employ Landau theory, extending an investigation begun by Yamashita and Ueda for the case of S=1…
Statistics of Peculiar Velocities from Cosmic Strings
R. Moessner
We calculate the probability distribution of a single component of peculiar velocities due to cosmic strings, smoothed over regions with a radius of several Mpc. The proba…
Correlations and phase structure of Ising models at complex temperature
F. Beichert, C. A. Hooley, R. Moessner +1
We investigate the spin-spin correlation functions of Ising magnets at complex values of the temperature, T. For one-dimensional chain and ladder systems, we show the existence of…
Designing Topological Bands in Reciprocal Space
N. R. Cooper, R. Moessner
Motivated by new capabilities to realise artificial gauge fields in ultracold atomic systems, and by their potential to access correlated topological phases in lattice systems, we…
Magnetic properties of the Hubbard model on kagome stripes
O. Derzhko, M. Maksymenko, J. Richter +2
We consider the one-orbital -site repulsive Hubbard model on two kagome-like chains, both of which yield a completely dispersionless (flat) one-electron band. Using exact many-e…
Flux expulsion and greedy bosons: frustrated magnets at large N
O. Tchernyshyov, R. Moessner, S. L. Sondhi
We investigate the Sp(N) mean-field theory for frustrated quantum magnets. First, we establish some general properties of its solutions; in particular, for small spin we propose si…
Irrational charge from topological order
R. Moessner, S. L. Sondhi
Topological or deconfined phases of matter exhibit emergent gauge fields and quasiparticles that carry a corresponding gauge charge. In systems with an intrinsic conserved U(1) cha…
Electron interactions in graphene in a strong magnetic field
M. O. Goerbig, R. Moessner, B. Doucot
Graphene in the quantum Hall regime exhibits a multi-component structure due to the electronic spin and chirality degrees of freedom. While the applied field breaks the spin symmet…
Spin-Peierls phases in pyrochlore antiferromagnets
Oleg Tchernyshyov, R. Moessner, S. L. Sondhi
In the highly frustrated pyrochlore magnet spins form a lattice of corner sharing tetrahedra. We show that the tetrahedral ``molecule'' at the heart of this structure undergoes a J…
Planar pyrochlore, quantum ice and sliding ice
R. Moessner, Oleg Tchernyshyov, S. L. Sondhi
We study quantum antiferromagnetism on the highly frustrated checkerboard lattice, also known as the square lattice with crossings. The quantum Heisenberg antiferromagnet on this l…
Partial order from disorder in a classical pyrochlore antiferromagnet
Gia-Wei Chern, R. Moessner, O. Tchernyshyov
We investigate theoretically the phase diagram of a classical Heisenberg antiferromagnet on the pyrochlore lattice perturbed by a weak second-neighbor interaction J_2. The huge gro…
Itinerant electrons in the Coulomb phase
L. D. C. Jaubert, Swann Piatecki, Masudul Haque +1
We study the interplay between magnetic frustration and itinerant electrons. For example, how does the coupling to mobile charges modify the properties of a spin liquid, and does t…
High temperature onset of field-induced transitions in the spin-ice compound Dy2Ti2O7
M. J. Matthews, C. Castelnovo, R. Moessner +3
We have studied the field-dependent ac magnetic susceptibility of single crystals of Dy2Ti2O7 spin ice along the [111] direction in the temperature range 1.8 K - 7 K. Our data refl…
Dynamics of Fractionalization in Quantum Spin Liquids
J. Knolle, D. L. Kovrizhin, J. T. Chalker +1
We present the theory of dynamical spin-response for the Kitaev honeycomb model, obtaining exact results for the structure factor (SF) in gapped and gapless, Abelian and non-Abelia…
Classical spin-liquid on the maximally frustrated honeycomb lattice
J. Rehn, Arnab Sen, Kedar Damle +1
We show that the honeycomb Heisenberg antiferromagnet with , where are first-, second- and third-neighbour couplings respectively, forms a classical spin…
Spin glass behavior in a random Coulomb antiferromagnet
J. Rehn, R. Moessner, A. P. Young
We study spin glass behavior in a random Ising Coulomb antiferromagnet in two and three dimensions using Monte Carlo simulations. In two dimensions, we find a transition at zero te…
On product, generic and random generic quantum satisfiability
C. R. Laumann, A. M. Läuchli, R. Moessner +2
We report a cluster of results on k-QSAT, the problem of quantum satisfiability for k-qubit projectors which generalizes classical satisfiability with k-bit clauses to the quantum…