Non-Markovian effects in the spin-boson model at zero temperature

• URL: http://arxiv.org/abs/2101.09463v1
• Date: Sat, 23 Jan 2021 09:39:22 GMT
• Title: Non-Markovian effects in the spin-boson model at zero temperature
• Authors: Sebastian Wenderoth, Heinz-Peter Breuer, Michael Thoss
• Abstract summary: We investigate memory effects in the spin-boson model using a recently proposed measure for non-Markovian behavior. For a fast bath, we find non-Markovian dynamics for a coherently decaying spin at weak system-bath coupling.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We investigate memory effects in the spin-boson model using a recently proposed measure for non-Markovian behavior based on the information exchange between an open system and its environment. Employing the numerical exact multilayer multiconfguration time-dependent Hartree approach, we simulate the dynamics of the spin-boson model at zero temperature for a broad range of parameters. For a fast bath, i.e. in the scaling limit, we find non-Markovian dynamics for a coherently decaying spin at weak system-bath coupling, whereas memory effects are absent for stronger coupling in the regimes of incoherent decay and localization. If the time scales of system and bath are comparable, a complex, non-monotonic dependence of non-Markovianity on the system-bath coupling strength is observed.

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