Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session N01: Poster Session II (4:00pm-6:00pm, PT)
4:00 PM,
Wednesday, June 7, 2023
Room: Exhibit Hall C
Abstract: N01.00072 : Nonperturbative Treatment of Giant Atoms Using Chain Transformations*
Presenter:
David D Noachtar
(Harvard Physics Department & Technical University of Munich)
Authors:
David D Noachtar
(Harvard Physics Department & Technical University of Munich)
Johannes Knörzer
(ETH Zürich Institute for Theoretical Studies & Max Planck Institute of Quantum Optics)
Robert H Jonsson
(Nordita & Max Planck Institute of Quantum Optics)
While previous studies of giant atoms focused on the realm of the rotating-wave approximation (RWA), we go beyond this and perform a numerically exact analysis of giant atoms strongly coupled to their environment, in regimes where counter-rotating terms cannot be neglected. To achieve this, we use Lanczos transformations to cast the field Hamiltonian into the form of a one-dimensional chain and employ matrix-product state simulations. This yields access to all system-bath observables, in yet unexplored parameter regimes. We confirm the emergence of oscillating bound states and demonstrate the breakdown of the RWA in the strong coupling regime.
*R.H.J. acknowledges support by the Wenner-Gren Foundations. J.K. acknowledges support from the European Union's Horizon 2020 FET-Open project SuperQuLAN (899354) and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy – EXC-2111 – 390814868.
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