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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
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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