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Lindblad dynamics from spatio-temporal correlation functions in nonintegrable spin-1/2 chains with different boundary conditions

Markus Kraft1,*, Jonas Richter2,3, Fengping Jin4, Sourav Nandy5, Jacek Herbrych6, Kristel Michielsen4, Hans De Raedt7, Jochen Gemmer1, and Robin Steinigeweg1,†

  • *markus.kraft@uos.de
  • †rsteinig@uos.de
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Phys. Rev. Research 6, 023251 – Published 6 June, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.023251

Abstract

We investigate the Lindblad equation in the context of boundary-driven magnetization transport in spin-1/2 chains. Our central question is whether the nonequilibrium steady state of the open system, including its buildup in time, can be described on the basis of the dynamics in the closed system. To this end, we rely on a previous study [Heitmann et al., Phys. Rev. B 108, L201119 (2023)], in which a description in terms of spatio-temporal correlation functions was suggested in the case of weak driving and small system-bath coupling. Because this work focused on integrable systems and periodic boundary conditions, we here extend the analysis in three directions: (1) We consider nonintegrable systems, (2) we take into account open boundary conditions and other bath-coupling geometries, and (3) we provide a comparison to time-evolving block decimation. While we find that nonintegrability plays a minor role, the choice of the specific boundary conditions can be crucial due to potentially nondecaying edge modes. Our large-scale numerical simulations suggest that a description based on closed-system correlation functions is a useful alternative to already existing state-of-the-art approaches.

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Phys. Rev. Research 6, 023251– Published 6 June, 2024
  • Received 8 March 2024
  • Accepted 15 May 2024
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