
arXiv: 1501.04571
We elaborate on the principle that for gapped quantum spin systems with local interaction, “local perturbations [in the Hamiltonian] perturb locally [the groundstate].” This principle was established by Bachmann et al. [Commun. Math. Phys. 309, 835–871 (2012)], relying on the “spectral flow technique” or “quasi-adiabatic continuation” [M. B. Hastings, Phys. Rev. B 69, 104431 (2004)] to obtain locality estimates with sub-exponential decay in the distance to the spatial support of the perturbation. We use ideas of Hamza et al. [J. Math. Phys. 50, 095213 (2009)] to obtain similarly a transformation between gapped eigenvectors and their perturbations that is local with exponential decay. This allows to improve locality bounds on the effect of perturbations on the low lying states in certain gapped models with a unique “bulk ground state” or “topological quantum order.” We also give some estimate on the exponential decay of correlations in models with impurities where some relevant correlations decay faster than one would naively infer from the global gap of the system, as one also expects in disordered systems with a localized groundstate.
FOS: Physical sciences, LIEB-ROBINSON BOUNDS, Interacting particle systems in time-dependent statistical mechanics, 01 Mathematical Sciences, Mathematical Physics, Condensed Matter - Statistical Mechanics, Dynamics of disordered systems (random Ising systems, etc.) in time-dependent statistical mechanics, Quantum Physics, Science & Technology, 02 Physical Sciences, STABILITY, Statistical Mechanics (cond-mat.stat-mech), Physics, Mathematical Physics (math-ph), Dynamic lattice systems (kinetic Ising, etc.) and systems on graphs in time-dependent statistical mechanics, quantum spin systems, Physics, Mathematical, GROUND-STATE, Physical Sciences, Lieb-Robinson propagation, 51 Physical sciences, Quantum Physics (quant-ph), QUANTUM, DECAY, 49 Mathematical sciences
FOS: Physical sciences, LIEB-ROBINSON BOUNDS, Interacting particle systems in time-dependent statistical mechanics, 01 Mathematical Sciences, Mathematical Physics, Condensed Matter - Statistical Mechanics, Dynamics of disordered systems (random Ising systems, etc.) in time-dependent statistical mechanics, Quantum Physics, Science & Technology, 02 Physical Sciences, STABILITY, Statistical Mechanics (cond-mat.stat-mech), Physics, Mathematical Physics (math-ph), Dynamic lattice systems (kinetic Ising, etc.) and systems on graphs in time-dependent statistical mechanics, quantum spin systems, Physics, Mathematical, GROUND-STATE, Physical Sciences, Lieb-Robinson propagation, 51 Physical sciences, Quantum Physics (quant-ph), QUANTUM, DECAY, 49 Mathematical sciences
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