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Open Quantum Systems Decoherence Quantum Simulation

The finite-difference parquet method: Enhanced electron-paramagnon scattering opens a pseudogap.

PubMed
Authors: Lihm JM, Kiese D, Lee SB, Kugler FB

Year

2026

Paper ID

30302

Status

Peer-reviewed

Abstract Read

~2 min

Abstract Words

93

Citations

3

Abstract

We present the finite-difference parquet method that greatly improves the applicability and accuracy of two-particle correlation approaches to interacting electron systems. This method incorporates the nonperturbative local physics from a reference solution and builds all parquet diagrams while circumventing potentially divergent irreducible vertices. Its unbiased treatment of different fluctuations is crucial for reproducing the strong-coupling pseudogap in the underdoped Hubbard model, consistent with diagrammatic Monte Carlo calculations. We reveal a strong-coupling spin-fluctuation mechanism of the pseudogap with decisive vertex corrections that encode the enhanced, energy-dependent scattering amplitude between electrons and antiferromagnetic spin fluctuations.

Why This Paper Matters

  • This paper contributes to the Quantum Simulation research area in the Quantum Articles archive.
  • It adds a 2026 reference point for readers tracking recent quantum research.
  • We present the finite-difference parquet method that greatly improves the applicability and accuracy of two-particle correlation approaches to interacting electron systems.

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References & Citation Signals

[1] DOI https://doi.org/10.1073/pnas.2525308123 [2] Publisher https://pubmed.ncbi.nlm.nih.gov/41774791/

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External citation index: OpenAlex citation signal • updated 2026-10-27 19:17:34

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