Holstein mechanism in single-site model with unitary evolution

Chen-Huan Wu

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arXiv · 2505.16020

Holstein mechanism in single-site model with unitary evolution

Chen-Huan Wu

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Abstract

We investigate the Holstein mechanism in a single-electron (one-site) system, where unitary evolution intrinsically involves both fermion and boson operators under nonadiabatic conditions. The resulting unitary dynamics and boson-frequency dependence reveal a quantum phase transition, evidenced by distinct short-time (power-law decay) and long-time (exponential decay) behaviors, which are manifested in the polaronic shift, bosonic energy, and dynamics of reduced density matrix. This observation is consistent with a non-Markovian to Markovian transition.

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Chen-Huan Wu. 2025-05-21. Holstein mechanism in single-site model with unitary evolution. https://arxiv.org/abs/2505.16020

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