49 citations · 420 across the 22 of their papers we have counts for
22 papers
Saddles-to-minima topological crossover and glassiness in the Rubik's Cube
Alex Gower, Oliver Hart, Claudio Castelnovo
Slow relaxation and glassiness have been the focus of extensive research attention, along with popular and technological interest, for many decades. While much understanding has be…
Towards absolutely stable ergodicity breaking in two and three dimensions
Charles Stahl, Oliver Hart, Rahul Nandkishore
We propose new physically reasonable systems capable of avoiding ergodicity at infinite time in the thermodynamic limit, even with generic perturbations and when coupled to a heat…
Robust Hilbert space fragmentation in group-valued loop models
Alexey Khudorozhkov, Charles Stahl, Oliver Hart +1
We introduce a large class of models exhibiting robust ergodicity breaking in quantum dynamics. Our work is inspired by recent discussions of "topologically robust Hilbert space fr…
Playing nonlocal games across a topological phase transition on a quantum computer
Oliver Hart, David T. Stephen, Dominic J. Williamson +2
Many-body quantum games provide a natural perspective on phases of matter in quantum hardware, crisply relating the quantum correlations inherent in phases of matter to the securin…
Exact Mazur bounds in the pair-flip model and beyond
Oliver Hart
By mapping the calculation of Mazur bounds to the enumeration of walks on fractal structures, we present exact bounds on the late-time behavior of spin autocorrelation functions in…
Topologically stable ergodicity breaking from emergent higher-form symmetries in generalized quantum loop models
Charles Stahl, Rahul Nandkishore, Oliver Hart
We present a set of generalized quantum loop models which provably exhibit topologically stable ergodicity breaking. These results hold for both periodic and open boundary conditio…
Multipole groups and fracton phenomena on arbitrary crystalline lattices
Daniel Bulmash, Oliver Hart, Rahul Nandkishore
Multipole symmetries are of interest in multiple contexts, from the study of fracton phases, to nonergodic quantum dynamics, to the exploration of new hydrodynamic universality cla…
Probing fractional statistics in quantum simulators of spin liquid Hamiltonians
Shiyu Zhou, Maria Zelenayova, Oliver Hart +2
Recent advances in programmable quantum devices brought to the fore the intriguing possibility of using them to realise and investigate topological quantum spin liquid phases. This…
Ergodicity breaking provably robust to arbitrary perturbations
David T. Stephen, Oliver Hart, Rahul M. Nandkishore
We present a new route to ergodicity breaking via Hilbert space fragmentation that displays an unprecedented level of robustness. Our construction relies on a single emergent (pret…
Measurement-induced phases of matter require feedback
Aaron J. Friedman, Oliver Hart, Rahul Nandkishore
We explore universality and phases of matter in hybrid quantum dynamics combining chaotic time evolution and projective measurements. We develop a unitary representation of measure…
Extracting spinon self-energies from two-dimensional coherent spectroscopy
Oliver Hart, Rahul Nandkishore
Two-dimensional coherent spectroscopy (2DCS) is a nonlinear spectroscopy technique capable of identifying whether apparent continua in linear response are made out of multiplets of…
Fracton magnetohydrodynamics
Marvin Qi, Oliver Hart, Aaron J. Friedman +2
We extend recent work on hydrodynamics with global multipolar symmetries -- known as "fracton hydrodynamics" -- to systems in which the multipolar symmetries are gauged. We refer t…
Hilbert space shattering and dynamical freezing in the quantum Ising model
Oliver Hart, Rahul Nandkishore
We discuss quantum dynamics in the transverse field Ising model in two spatial dimensions. We show that, up to a prethermal timescale, which we quantify, the Hilbert space 'shatter…
Effects of critical correlations on quantum percolation in two dimensions
Giuseppe De Tomasi, Oliver Hart, Cecilie Glittum +1
We analyze the out-of-equilibrium dynamics of a quantum particle coupled to local magnetic degrees of freedom that undergo a classical phase transition. Specifically, we consider a…
Hidden quasiconservation laws in fracton hydrodynamics
Oliver Hart, Andrew Lucas, Rahul Nandkishore
We show that the simplest universality classes of fracton hydrodynamics in more than one spatial dimension, including isotropic theories of charge and dipole conservation, can exhi…
Spectroscopic fingerprints of gapless type-II fracton phases
Oliver Hart, Rahul Nandkishore
Fracton phases feature elementary excitations with fractionalized mobility and are exciting interest from multiple areas of theoretical physics. However, the most exotic 'type-II'…
Logarithmic entanglement growth from disorder-free localization in the two-leg compass ladder
Oliver Hart, Sarang Gopalakrishnan, Claudio Castelnovo
We explore the finite-temperature dynamics of the quasi-1D orbital compass and plaquette Ising models. We map these systems onto a model of free fermions coupled to strictly locali…
From compact localized states to many-body scars in the random quantum comb
Oliver Hart, Giuseppe De Tomasi, Claudio Castelnovo
In this work we investigate the effects of configurational disorder on the eigenstates and dynamical properties of a tight-binding model on a quasi-one-dimensional comb lattice, co…
Coherent propagation of quasiparticles in topological spin liquids at finite temperature
Oliver Hart, Yuan Wan, Claudio Castelnovo
The appearance of quasiparticle excitations with fractional statistics is a remarkable defining trait of topologically ordered systems. In this work, we investigate the experimenta…
Long-range Coulomb interactions and nonhydrodynamic behavior in thermal quenches in spin ice
Oliver Hart, Marianne Haroche, Claudio Castelnovo
When spin ice systems undergo a sudden thermal quench, they have been shown to enter long-lived metastable states where the monopole excitations form so-called noncontractible pair…
Steady-state superconductivity in electronic materials with repulsive interactions
Oliver Hart, Garry Goldstein, Claudio Chamon +1
We study the effect of laser driving on a minimal model for a hexagonal two-dimensional material with broken inversion symmetry. Through the application of circularly polarised lig…
Entanglement negativity and sudden death in the toric code at finite temperature
Oliver Hart, Claudio Castelnovo
We study the fate of quantum correlations at finite temperature in the two-dimensional toric code using the logarithmic entanglement negativity. We are able to obtain exact results…