Impact of Dissipation on Universal Fluctuation Dynamics in Open Quantum Systems

Fujimoto, Kazuya; Hamazaki, Ryusuke; Kawaguchi, Yasuo

doi:10.48550/arxiv.2202.02176

Cited by 1 publication

(1 citation statement)

References 77 publications

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“…positive). As a consequence, the interface profile µ(x) can be reconstructed by "integrating" the density profile n(x) on the chain [50][51][52][53]:…”

Section: B Smooth Domain Walls On the Latticementioning

confidence: 99%

Interface dynamics in the two-dimensional quantum Ising model

Balducci¹,

Gambassi²,

Lerose³

et al. 2022

Preprint

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In a recent paper [1] we have shown that the dynamics of interfaces, in the symmetry-broken phase of the two-dimensional ferromagnetic quantum Ising model, displays a robust form of ergodicity breaking. In this paper, we elaborate more on the issue. First, we discuss two classes of initial states on the square lattice, the dynamics of which is driven by complementary terms in the effective Hamiltonian and may be solved exactly: (a) strips of consecutive neighbouring spins aligned in the opposite direction of the surrounding spins, and (b) a large class of initial states, characterized by the presence of a well-defined "smooth" interface separating two infinitely extended regions with oppositely aligned spins. The evolution of the latter states can be mapped onto that of an effective one-dimensional fermionic chain, which is integrable in the infinite-coupling limit. In this case, deep connections with noteworthy results in mathematics emerge, as well as with similar problems in classical statistical physics. We present a detailed analysis of the evolution of these interfaces both on the lattice and in a suitable continuum limit, including the interface fluctuations and the dynamics of entanglement entropy. Second, we provide analytical and numerical evidence supporting the conclusion that the observed non-ergodicity -arising from Stark localization of the effective fermionic excitations -persists away from the infinite-Ising-coupling limit, and we highlight the presence of a timescale T ∼ e cL ln L for the decay of a region of large linear size L. The implications of our work for the classic problem of the decay of a false vacuum are also discussed.

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“…positive). As a consequence, the interface profile µ(x) can be reconstructed by "integrating" the density profile n(x) on the chain [50][51][52][53]:…”

Section: B Smooth Domain Walls On the Latticementioning

confidence: 99%