Dephasing-assisted transport in a tight-binding chain with a linear potential
| Autor: | Jacob, Samuel L., Bettmann, Laetitia P., Lacerda, Artur M., Zawadzki, Krissia, Clark, Stephen R., Goold, John, Mendoza-Arenas, Juan José |
|---|---|
| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | An environment interacting with a quantum system can enhance transport through the suppression of quantum effects responsible for localization. In this paper, we study the interplay between bulk dephasing and a linear potential in a boundary-driven tight-binding chain. A linear potential induces Wannier-Stark localization in the absence of noise, while dephasing induces diffusive transport in the absence of a tilt. We derive an approximate expression for the steady-state current as a function of both dephasing and tilt which closely matches the exact solution for a wide range of parameters. From it, we find that the maximum current occurs for a dephasing rate equal to the period of Bloch oscillations in the Wannier-Stark localized system. We also find that the current displays a maximum as a function of the system size, provided that the total potential tilt across the chain remains constant. Our results can be verified in current experimental platforms and represents a step forward in analytical studies of environment-assisted transport. Comment: Submitted to Frontiers in Physics. 20 pages, 7 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|