Dephasing-assisted transport in a tight-binding chain with a linear potential.
JACOB, Samuel L.; BETTMANN, Laetitia P.; LACERDA, Artur Machado; ZAWADZKI, Krissia; CLARK, Stephen R.; GOOLD, John; ARENAS, Juan José Mendoza.
JACOB, Samuel L.; BETTMANN, Laetitia P.; LACERDA, Artur Machado; ZAWADZKI, Krissia; CLARK, Stephen R.; GOOLD, John; ARENAS, Juan José Mendoza.
Abstract: 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.
@article={003222477,author = {JACOB, Samuel L.; BETTMANN, Laetitia P.; LACERDA, Artur Machado; ZAWADZKI, Krissia; CLARK, Stephen R.; GOOLD, John; ARENAS, Juan José Mendoza.},title={Dephasing-assisted transport in a tight-binding chain with a linear potential},journal={Frontiers in Physics},note={v. 12, p. 1474018-1-1474018-9 + supplementary material},year={2024}}