4.6 Article

Probing topological states through the exact non-Markovian decoherence dynamics of a spin coupled to a spin bath in the real-time domain

Journal

PHYSICAL REVIEW B
Volume 102, Issue 3, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.102.035133

Keywords

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Funding

  1. Ministry of Science and Technology of Taiwan [MOST-108-2112-M-006-009-MY3]

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In this paper, we explore the decoherence dynamics of a probing spin coupled to a spin bath, where the spin bath is given by a controllable 1D transverse-field Ising chain. The 1D transverse-field Ising chain with free-end boundary condition is equivalent to a modified Kitaev model with nonlocal Majorana bound states in its topological phase. We find that the non-Markovian decoherence dynamics of the probing spin can manifest the topological structure of the spin chain. By controlling the external magnetic field on the Ising chain, we find a close relationship between the topological phase transition and the non-Markovian dynamics in the real-time domain. We also investigate the corresponding quantum entanglement dynamics in this topological system.

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