486 citations · 7.2k across the 96 of their papers we have counts for
26 papers · 1 filter
Operator dynamics in Floquet many-body systems
Takato Yoshimura, Samuel J. Garratt, J. T. Chalker
We study operator dynamics in many-body quantum systems, focusing on generic features of systems that are ergodic, spatially extended, and lack conserved densities. Quantum circuit…
Spectral Lyapunov exponents in chaotic and localized many-body quantum systems
Amos Chan, Andrea De Luca, J. T. Chalker
We consider the spectral statistics of the Floquet operator for disordered, periodically driven spin chains in their quantum chaotic and many-body localized phases (MBL). The spect…
Many-body delocalisation as symmetry breaking
S. J. Garratt, J. T. Chalker
We present a framework in which the transition between a many-body localised (MBL) phase and an ergodic one is symmetry breaking. We consider random Floquet spin chains, expressing…
Local pairing of Feynman histories in many-body Floquet models
S. J. Garratt, J. T. Chalker
We study many-body quantum dynamics using Floquet quantum circuits in one space dimension as simple examples of systems with local interactions that support ergodic phases. Physica…
Measurement-induced steering of quantum systems
Sthitadhi Roy, J. T. Chalker, I. V. Gornyi +1
We set out a general protocol for steering the state of a quantum system from an arbitrary initial state towards a chosen target state by coupling it to auxiliary quantum degrees o…
Spectral statistics and many-body quantum chaos with conserved charge
Aaron J. Friedman, Amos Chan, Andrea De Luca +1
We investigate spectral statistics in spatially extended, chaotic many-body quantum systems with a conserved charge. We compute the spectral form factor analytically for a m…
Eigenstate Correlations, Thermalization and the Butterfly Effect
Amos Chan, Andrea De Luca, J. T. Chalker
We discuss eigenstate correlations for ergodic, spatially extended many-body quantum systems, in terms of the statistical properties of matrix elements of local observables. While…
Spectral statistics in spatially extended chaotic quantum many-body systems
Amos Chan, Andrea De Luca, J. T. Chalker
We study spectral statistics in spatially extended chaotic quantum many-body systems, using simple lattice Floquet models without time-reversal symmetry. Computing the spectral for…
Solution of a minimal model for many-body quantum chaos
Amos Chan, Andrea De Luca, J. T. Chalker
We solve a minimal model for quantum chaos in a spatially extended many-body system. It consists of a chain of sites with nearest-neighbour coupling under Floquet time evolution. Q…
Deconfinement transitions in a generalised XY model
Pablo Serna, J. T. Chalker, Paul Fendley
We find the complete phase diagram of a generalised XY model that includes half-vortices. The model possesses superfluid, pair-superfluid and disordered phases, separated by Koster…
Classical spin liquids in stacked triangular lattice Ising antiferromagnets
D. T. Liu, F. J. Burnell, L. D. C. Jaubert +1
We study Ising antiferromagnets that have nearest-neighbour interactions on multilayer triangular lattices with frustrated ( and ) stacking, and make comparisons with th…
Frustration and Correlations in Stacked Triangular Lattice Ising Antiferromagnets
F. J. Burnell, J. T. Chalker
We study multilayer triangular lattice Ising antiferromagnets with interlayer interactions that are weak and frustrated in an abc stacking. By analysing a coupled height model desc…
Length Distributions in Loop Soups
Adam Nahum, J. T. Chalker, P. Serna +2
Statistical lattice ensembles of loops in three or more dimensions typically have phases in which the longest loops fill a finite fraction of the system. In such phases it is natur…
Phase transitions in 3D loop models and the model
Adam Nahum, J. T. Chalker, P. Serna +2
We consider the statistical mechanics of a class of models involving close-packed loops with fugacity on three-dimensional lattices. The models exhibit phases of two types as a…
Universal statistics of vortex lines
Adam Nahum, J. T. Chalker
We study the vortex lines that are a feature of many random or disordered three-dimensional systems. These show universal statistical properties on long length scales, and geometri…
3D loop models and the CP^{n-1} sigma model
Adam Nahum, J. T. Chalker, P. Serna +2
Many statistical mechanics problems can be framed in terms of random curves; we consider a class of three-dimensional loop models that are prototypes for such ensembles. The models…
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…
Classical to quantum mapping for an unconventional phase transition in a three-dimensional classical dimer model
Stephen Powell, J. T. Chalker
We study the transition between a Coulomb phase and a dimer crystal observed in numerical simulations of the three-dimensional classical dimer model, by mapping it to a quantum mod…
The Kasteleyn transition in three dimensions: spin ice in a [100] field
Ludovic D. C. Jaubert, J. T. Chalker, P. C. W. Holdsworth +1
We discuss the nearest neighbour spin ice model in the presence of a magnetic field placed along the cubic [100] direction. As recently shown in Phys. Rev. Lett. 100, 067207, 2008,…
SU(2)-invariant continuum theory for an unconventional phase transition in a three-dimensional classical dimer model
Stephen Powell, J. T. Chalker
We derive a continuum theory for the phase transition in a classical dimer model on the cubic lattice, observed in recent Monte Carlo simulations. Our derivation relies on the mapp…
Classical-Quantum Mappings for Geometrically Frustrated Systems: Spin Ice in a [100] Field
Stephen Powell, J. T. Chalker
Certain classical statistical systems with strong local constraints are known to exhibit Coulomb phases, where long-range correlation functions have power-law forms. Continuous tra…
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…
Critical phenomena in a highly constrained classical spin system: Neel ordering from the Coulomb phase
T. S. Pickles, T. E. Saunders, J. T. Chalker
Many classical, geometrically frustrated antiferromagnets have macroscopically degenerate ground states. In a class of three-dimensional systems, the set of degenerate ground state…
Negative scaling dimensions and conformal invariance at the Nishimori point in the +/-J random-bond Ising model
Florian Merz, J. T. Chalker
We reexamine the disorder-dominated multicritical point of the two-dimensional +/-J Ising model, known as the Nishimori point (NP). At the NP we investigate numerically and analyti…