Crossover from a delocalized to localized atomic excitation in an atom-waveguide interface

H. H. Jen*, J. S. You

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

An atom-waveguide system, which presents one of the quantum interfaces that enable strong couplings between light and atoms, can support tightly-confined guided modes of light. In this distinctive quantum interface, we theoretically investigate the crossover from a delocalized to localized atomic excitation under long-range dipole-dipole interactions and lattice disorders. Both localization lengths of the excitation distributions and power-law scalings of dissipative von Neumann entanglement entropy show signatures of this crossover. We further calculate numerically the level statistics of the underlying non-Hermitian Hamiltonian, from which as the disorder strength increases, the gap ratio decreases and the intrasample variance increases before reaching respective saturated values. The mean gap ratio in the deeply localized regime is close to the one from Poisson statistics along with a relatively large intrasample variance, whereas in the nondisordered regime, a significant level repulsion emerges. Our results provide insights to study the non-ergodic phenomenon in an atom-waveguide interface, which can be potentially applied to photon storage in this interface under dissipations.

原文英語
文章編號105002
期刊Journal of Physics B: Atomic, Molecular and Optical Physics
54
發行號10
DOIs
出版狀態已發佈 - 2021 五月

ASJC Scopus subject areas

  • 原子與分子物理與光學
  • 凝聚態物理學

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