486 citations · 7.2k across the 96 of their papers we have counts for
27 papers · 1 filter
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…
Goldstone modes in the emergent gauge fields of a frustrated magnet
Samuel J. Garratt, J. T. Chalker
We consider magnon excitations in the spin-glass phase of geometrically frustrated antiferromagnets with weak exchange disorder, focussing on the nearest-neighbour pyrochlore-latti…
Magnetic excitations of the classical spin liquid MgCr2O4
X. Bai, J. A. M. Paddison, E. Kapit +9
We report a comprehensive inelastic neutron-scattering study of the frustrated pyrochlore antiferromagnet MgCr2O4 in its cooperative paramagnetic regime. Theoretical modeling yield…
Coherent hole propagation in an exactly solvable gapless spin liquid
Gábor B. Halász, J. T. Chalker
We examine the dynamics of a single hole in the gapless phase of the Kitaev honeycomb model, focusing on the slow-hole regime where the bare hopping amplitude is much less than…
Majorana spectroscopy of 3D Kitaev spin-liquids
A. Smith, J. Knolle, D. L. Kovrizhin +2
We analyse the dynamical response of a range of 3D Kitaev quantum spin-liquids, using lattice models chosen to explore the different possible low-energy spectra for gapless Majoran…
Long-range Magnetic Order in Models for Rare Earth Quasicrystals
Stefanie Thiem, J. T. Chalker
We take a two-step theoretical approach to study magnetism of rare earth quasicrystals by considering Ising spins on quasiperiodic tilings, coupled via RKKY interactions. First, we…
Emergent Symmetry at the Néel to Valence-Bond-Solid Transition
Adam Nahum, P. Serna, J. T. Chalker +2
We show numerically that the `deconfined' quantum critical point between the Néel antiferromagnet and the columnar valence-bond-solid, for a square lattice of spin-1/2s, has an eme…
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-…
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…
Deconfined Quantum Criticality, Scaling Violations, and Classical Loop Models
Adam Nahum, J. T. Chalker, P. Serna +2
Numerical studies of the Néel to valence-bond solid phase transition in 2D quantum antiferromagnets give strong evidence for the remarkable scenario of deconfined criticality, but…
Magnetism in Rare Earth Quasicrystals: RKKY Interactions and Ordering
Stefanie Thiem, J. T. Chalker
We study magnetism in simple models for rare earth quasicrystals by means of a two-step theoretical approach. First, we compute RKKY interactions from a tight-binding Hamiltonian d…
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…
Dynamics of a two-dimensional quantum spin liquid: signatures of emergent Majorana fermions and fluxes
J. Knolle, D. L. Kovrizhin, J. T. Chalker +1
Topological states of matter present a wide variety of striking new phenomena. Prominent among these is the fractionalisation of electrons into unusual particles: Majorana fermions…
Solution of a model for the two-channel electronic Mach-Zehnder interferometer
M. J. Rufino, D. L. Kovrizhin, J. T. Chalker
We develop the theory of electronic Mach-Zehnder interferometers built from quantum Hall edge states at Landau level filling factor ν= 2, which have been investigated in a series o…
Relaxation in driven integer quantum Hall edge states
D. L. Kovrizhin, J. T. Chalker
A highly non-thermal electron distribution is generated when quantum Hall edge states originating from sources at different potentials meet at a quantum point contact. The relaxati…
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…
Equilibration of integer quantum Hall edge states
D. L. Kovrizhin, J. T. Chalker
We study equilibration of quantum Hall edge states at integer filling factors, motivated by experiments involving point contacts at finite bias. Idealising the experimental situati…
Disorder in a quantum spin liquid: flux binding and local moment formation
A. J. Willans, J. T. Chalker, R. Moessner
We study the consequences of disorder in the Kitaev honeycomb model, considering both site dilution and exchange randomness. We show that a single vacancy binds a flux and induces…
Absent pinch points and emergent clusters: further neighbour interactions in the pyrochlore Heisenberg antiferromagnet
P. H. Conlon, J. T. Chalker
We discuss the origin of spin correlations observed in neutron scattering experiments on the paramagnetic phase of a number of frustrated spinel compounds, most notably ZnCr2O4. Th…
Multiparticle interference in electronic Mach-Zehnder interferometers
D. L. Kovrizhin, J. T. Chalker
We study theoretically electronic Mach-Zehnder interferometers built from integer quantum Hall edge states, showing that the results of recent experiments can be understood in term…
Spin Dynamics in Pyrochlore Heisenberg Antiferromagnets
P. H. Conlon, J. T. Chalker
We study the low temperature dynamics of the classical Heisenberg antiferromagnet with nearest neighbour interactions on the pyrochlore lattice. We present extensive results for th…
Structural phase transitions in geometrically frustrated antiferromagnets
Timothy E. Saunders, John T. Chalker
We study geometrically frustrated antiferromagnets with magnetoelastic coupling. Frustration in these systems may be relieved by a structural transition to a low temperature phase…
Spin Freezing in Geometrically Frustrated Antiferromagnets with Weak Disorder
T. E. Saunders, J. T. Chalker
We investigate the consequences for geometrically frustrated antiferromagnets of weak disorder in the strength of exchange interactions. Taking as a model the classical Heisenberg…
Commensurate and incommensurate ground states of Cs_2CuCl_4 in a magnetic field
M. Y. Veillette, J. T. Chalker
We present calculations of the magnetic ground state of Cs_2CuCl_4 in an applied magnetic field, with the aim of understanding the commensurately ordered state that has been discov…