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  • Letter
  • Open Access

Orthogonality catastrophe beyond bosonization from post-selection

Martino Stefanini* and Jamir Marino

  • *Contact author: mstefa@uni-mainz.de
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Phys. Rev. Research 6, L042022 – Published 23 October, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L042022

Abstract

We show that the dynamics induced by post-selected measurements can serve as a controlled route to access physical processes beyond the boundaries of Luttinger liquid physics. We consider a one-dimensional fermionic wire whose dynamics results from a sequence of weak measurements of the fermionic density at a given site, interspersed with unitary hopping dynamics. This realizes a non-Hermitian variant of the celebrated instance of a local scatterer in a fermionic system and its ensuing orthogonality catastrophe. We observe a distinct crossover in the system's time evolution as a function of the fermion density. In the high-density regime, reminiscent of the Hermitian case, a bosonized version of the model properly describes the dynamics while, as we delve into the low-density regime, the validity of bosonization breaks down, giving rise to irreversible behavior. Notably, this crossover from reversible to irreversible dynamics is nonperturbative in the measurement rate and can manifest itself even with relatively shallow measurement rates, provided that the system's density remains below the crossover threshold. Our results render a conceptually transparent model for exploring nonperturbative effects beyond bosonization, which could be used as a stepping stone to explore novel routes for the control of nonlinear dynamics in low-dimensional quantum systems.

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Phys. Rev. Research 6, L042022– Published 23 October, 2024
  • Received 27 October 2023
  • Revised 12 June 2024
  • Accepted 13 August 2024
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