Single-photon scattering and bound states in an atom-waveguide system with two or multiple coupling points

• URL: http://arxiv.org/abs/2001.00414v2
• Date: Tue, 5 May 2020 09:21:27 GMT
• Title: Single-photon scattering and bound states in an atom-waveguide system with two or multiple coupling points
• Authors: Wei Zhao and Zhihai Wang
• Abstract summary: In this paper, we investigate the single-photon scattering and bound states in a one-dimensional coupled-resonator waveguide. When the atom couples to the waveguide via two resonators, the single-photon reflection rate is characterized by either Breit-Wigner or Fano line shapes. We also find a phase transition phenomena for the multi-resonator coupling case, which reveals that the upper bound state only exists when the atom-waveguide coupling strength is above a critical value.
• Score: 4.703879128689288
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In this paper, we investigate the single-photon scattering and bound states in a one-dimensional coupled-resonator waveguide which couples to a single artificial giant atom with two or more coupling points. When the atom couples to the waveguide via two resonators, the single-photon reflection rate is characterized by either Breit-Wigner or Fano line shapes. When the atom couples to the waveguide via multiple resonators, we numerically show how the destructive interference effect leads to a complete single-photon reflection. We also find a phase transition phenomena for the multi-resonator coupling case, which reveals that the upper bound state only exists when the atom-waveguide coupling strength is above a critical value.

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