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  • Open Access

Floquet engineering of quantum transport through two driven impurities

Vincenzo Bruno1,2, Corinna Kollath1, Roberta Citro2,3, and Ameneh Sheikhan1

  • 1Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Germany
  • 2Dipartimento di Fisica ‘‘E.R. Caianiello,” Università degli Studi di Salerno and INFN, Sezione di Napoli, Gruppo collegato di Salerno, Via Giovanni Paolo II, 132, I-84084 Fisciano (Sa), Italy
  • 3CNR/SPIN, 84084 Fisciano (Sa), Italy

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Phys. Rev. A 114, 023313 – Published 12 August, 2026

DOI: https://doi.org/10.1103/fx57-sknh

Abstract

Floquet engineering offers powerful tools to manipulate quantum states by periodically driving physical parameters. In this work, we investigate the quantum transport through two periodically driven impurities in a mesoscopic one-dimensional channel. By mapping the time-dependent Hamiltonian into an effective multichannel scattering problem, we unveil a rich landscape of transport phenomena arising from the interplay between Fabry-Pérot cavity modes and Fano interference. We demonstrate that the inter-impurity distance acts as a critical control parameter, allowing for the formation of bound states in the continuum (BICs). Furthermore, we identify quasi-BICs—extremely narrow resonances with finite lifetimes—that can be dynamically tuned by the drive amplitude. We show that these states enable a robust coherent trapping mechanism, allowing the system to switch from perfect transparency or reflection to strong localization with giant Wigner time delays. Our results suggest possible applications for tunable delay lines and quantum memories, with feasible experimental realizations in the context of cold atoms.

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Phys. Rev. A 114, 023313– Published 12 August, 2026
  • Received 1 June 2026
  • Accepted 27 July 2026
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