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Benchmarking the Exponential Ansatz for the Holstein model

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arxiv 2405.18771 v1 pith:2ZRJ5JIC submitted 2024-05-29 cond-mat.mtrl-sci physics.chem-ph

Junjie Yang , Zhi-Hao Cui , Ankit Mahajan , Huanchen Zhai , David R. Reichman , Garnet Kin-Lic Chan This is my paper · ORCID
classification cond-mat.mtrl-sciphysics.chem-ph
keywords holsteinmodelpolaronansatzexponentialsingle-electronacrossbenchmark
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Polarons are quasiparticles formed as a result of lattice distortions induced by charge carriers. The single-electron Holstein model captures the fundamentals of single polaron physics. We examine the power of the exponential ansatz for the polaron ground-state wavefunction in its coupled cluster, canonical transformation, and (canonically transformed) perturbative variants across the parameter space of the Holstein model. Our benchmark serves to guide future developments of polaron wavefunctions beyond the single-electron Holstein model.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Lattice stitching by eigenvector continuation for Holstein polaron

    quant-ph 2025-02 conditional novelty 6.0 of 10

    Ground-state energies of the 1D Holstein polaron at ω/t=0.1 can be obtained within a few percent error from eigenvector continuation over two- and four-site segments, cutting VQE qubit counts from 507 to 11.

  2. Light-Matter Hybridization and Entanglement from the First-Principles

    quant-ph 2024-11 conditional novelty 5.0 of 10

    A squeezed variational photon ansatz inside QEDHF reproduces DMRG entanglement trends and lowers mean-field energies in strong coupling.

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