Phonon-assisted coherent transport of excitations in Rydberg-dressed atom arrays

TL;DR

This paper introduces a microscopic model for phonon-assisted coherent transport of excitations in Rydberg-dressed atom arrays, revealing asymmetric Bloch oscillations and robust transport phenomena relevant for quantum simulation.

Contribution

It presents a novel, experimentally feasible Rydberg-dressed system model that demonstrates complex polaron dynamics and macroscopic transport under a constant force.

Findings

Asymmetric Bloch oscillations observed

Macroscopic transport of non-spreading excitations

Robustness against random potential

Abstract

Polarons, which arise from the self-trapping interaction between electrons and lattice distortions in a solid, have been known and extensively investigated for nearly a century. Nevertheless, the study of polarons continues to be an active and evolving field, with ongoing advancements in both fundamental understanding and practical applications. Here, we present a microscopic model that exhibits a diverse range of dynamic behavior, arising from the intricate interplay between two excitation-phonon coupling terms. The derivation of the model is based on an experimentally feasible Rydberg-dressed system with dipole-dipole interactions, making it a promising candidate for realization in a Rydberg atoms quantum simulator. Remarkably, our analysis reveals a growing asymmetry in Bloch oscillations, leading to a macroscopic transport of non-spreading excitations under a constant force. Moreover, we compare the behavior of excitations, when coupled to either acoustic or optical phonons, and demonstrate the robustness of our findings against on-site random potential. Overall, this work contributes to the understanding of polaron dynamics with their potential applications in coherent quantum transport and offers valuable insights for research on Rydberg-based quantum systems.