Title:	Quantum light-matter interactions in structured waveguides
Authors:	Bag, Rupak Roy, Dibyendu
Issue Date:	21-Nov-2023
Publisher:	American Physical Society
Citation:	Physical Review A, 2023, Vol.108, p053717
Abstract:	We explore special features of quantum light-matter interactions inside structured waveguides due to their finite bandwidth, band edges, and nontrivial topological properties. We model the waveguides as either a tight-binding (TB) chain or a Su-Schrieffer-Heeger (SSH) chain. For unstructured waveguides with infinite bandwidth, the transmission and reflection coefficients of a side-coupled two-level emitter (2LE) are the same as the reflection and transmission coefficients of a direct-coupled 2LE. We show that this analogy breaks down for structured waveguides with finite bandwidth due to the appearance of Lamb shift only for the direct-coupled 2LE. We further predict a robust light-emitter coupling at zero collective decay width of a single giant 2LE (with two couplings at different points) near the band edges of the structured waveguides where topological features can be beneficial. Finally, we study single-photon dynamics in a heterojunction of a long TB and short SSH waveguide connected to a 2LE at the SSH end. We show the propagation of a photon from the excited emitter to the TB waveguide only when the SSH waveguide is in the topological phase. Thus, the heterojunction acts as a conditional propagation channel.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/8175
Alternative Location:	https://arxiv.org/abs/2304.13306 https://doi.org/10.1103/PhysRevA.108.053717 https://ui.adsabs.harvard.edu/abs/2023arXiv230413306B/abstract https://inspirehep.net/literature/2654527
Copyright:	2023 American Physical Society
Appears in Collections:	Research Papers (TP)

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