Home > Publications database > Spin- 1/2 XXZ chain coupled to two Lindblad baths: Constructing nonequilibrium steady states from equilibrium correlation functions > print

001     1018613
005     20240213111709.0
024 7 _ |a 10.1103/PhysRevB.108.L201119
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024 7 _ |a 10.34734/FZJ-2023-04928
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100 1 _ |a Heitmann, Tjark
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245 _ _ |a Spin- 1/2 XXZ chain coupled to two Lindblad baths: Constructing nonequilibrium steady states from equilibrium correlation functions
260 _ _ |a Woodbury, NY
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520 _ _ |a State-of-the-art approaches to extract transport coefficients of many-body quantum systems broadly fall into two categories: (i) they target the linear-response regime in terms of equilibrium correlation functions of the closed system; or (ii) they consider an open-system situation typically modeled by a Lindblad equation, where a nonequilibrium steady state emerges from driving the system at its boundaries. While quantitative agreement between (i) and (ii) has been found for selected model and parameter choices, also disagreement has been pointed out in the literature. Studying magnetization transport in the spin-1/2 XXZ chain, we here demonstrate that at weak driving, the nonequilibrium steady state in an open system, including its buildup in time, can remarkably be constructed just on the basis of correlation functions in the closed system. We numerically illustrate this direct correspondence of closed-system and open-system dynamics, and show that it allows the treatment of comparatively large open systems, usually only accessible to matrix product state simulations. We also point out potential pitfalls when extracting transport coefficients from nonequilibrium steady states in finite systems.
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700 1 _ |a Richter, Jonas
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700 1 _ |a Jin, Fengping
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700 1 _ |a Nandy, Sourav
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700 1 _ |a Lenarčič, Zala
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700 1 _ |a Herbrych, Jacek
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700 1 _ |a Michielsen, Kristel
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700 1 _ |a De Raedt, Hans
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700 1 _ |a Gemmer, Jochen
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700 1 _ |a Steinigeweg, Robin
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773 _ _ |a 10.1103/PhysRevB.108.L201119
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