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Escaping fronts in local quenches of a confining spin chain

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arxiv 2401.04193 v3 pith:QYODN2HA submitted 2024-01-08 cond-mat.stat-mech hep-thquant-ph

A. Krasznai , G. Takács This is my paper · ORCID
classification cond-mat.stat-mechhep-thquant-ph
keywords quenchesconfininginitialstatevacuumbuiltchainescaping
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We consider local quenches from initial states generated by a single spin-flip in either the true or the false vacuum state of the confining quantum Ising spin chain in the ferromagnetic regime. Contrary to global quenches, where the light-cone behaviour is strongly suppressed, we find a significant light-cone signal propagating with a nonzero velocity besides the expected localised oscillating component. Combining an analytic representation of the initial state with a numerical description of the relevant excitations using the two-fermion approximation, we can construct the spectrum of post-quench excitations and their overlaps with the initial state, identifying the underlying mechanism. For confining quenches built upon the true vacuum, the propagating signal consists of superpositions of left and right-moving mesons escaping confinement. In contrast, for anti-confining quenches built upon the false vacuum it is composed of superpositions of left and right-moving bubbles which escape Wannier-Stark localisation.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Boundary quenches in (1+1)-dimensional conformal field theory

    cond-mat.stat-mech 2026-07 accept novelty 7.0 of 10

    A boundary quench in a (1+1)-d CFT makes one-point functions switch from old to new ground state across a light cone and makes adjacent-region entanglement jump by log(g_b/g_a).

  2. Probing Bound State Relaxation Dynamics in Systems Out-of-Equilibrium on Quantum Computers

    quant-ph 2025-07 conditional novelty 4.0 of 10

    A functional-derivative linear-response scheme is extended to time-dependent Hamiltonians and used to track bound-state and Bloch-oscillation relaxation in the mixed-field Ising model.

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