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arXiv · 1706.08272

Emergent transport in a many-body open system driven by interacting quantum baths

Juris Reisons·Eduardo Mascarenhas·Vincenzo Savona
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Abstract

We analyze an open many-body system that is strongly coupled at its boundaries to interacting quantum baths. We show that the two-body interactions inside the baths induce emergent phenomena in the spin transport. The system and baths are modeled as independent spin chains resulting in a global non-homogeneous XXZ model. The evolution of the system-bath state is simulated using matrix-product-states methods. We present two phase transitions induced by bath interactions. For weak bath interactions we observe ballistic and insulating phases. However, for strong bath interactions a diffusive phase emerges with a distinct power-law decay of the time-dependent spin current $Q\propto t^{-α}$. Furthermore, we investigate long-lasting current oscillations arising from the non-Markovian dynamics in the homogeneous case, and find a sharp change in their frequency scaling coinciding with the triple point of the phase diagram.

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Juris Reisons, Eduardo Mascarenhas, Vincenzo Savona. 2017-10-12. Emergent transport in a many-body open system driven by interacting quantum baths. https://doi.org/10.1103/physrevb.96.165137

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