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arXiv · 2311.14776

Quantum transport in an environment parametrized by dispersive bosons

Monodeep Chakraborty·Holger Fehske
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Abstract

We generalize the two-channel (Edwards) fermion-boson model describing quantum transport in a background medium to the more realistic case of dispersive bosons. Using the variational exact diagonalization technique, we numerically solve the extended model in a one-dimensional setting, for both downward and upward curved boson dispersion, and show that going away from the previous Einstein-boson assumption has profound consequences for the particle transport. Specifically, we analyze the ground-state and spectral properties and demonstrate the renormalization of the particle's coherent band, effective mass, photoemission spectra and fermion-boson correlation functions due to the interplay of fluctuations and correlations in a dispersive environment.

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Monodeep Chakraborty, Holger Fehske. 2023-11-24. Quantum transport in an environment parametrized by dispersive bosons. https://doi.org/10.1103/physrevb.109.085125

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