Approaching the adiabatic infimum of topological pumps on thin-film lithium niobate waveguides.

ABSTRACT: Topological pumps reveal topological insights of adiabatic mode evolution, in which adiabaticity plays a crucial role. However, the adiabatic infimum, i.e., the possible shortest evolution duration of an adiabatic topological pumping process, has remained elusive. In this study, we report the approach of adiabatic infimum in topological pumps in photonic waveguides based on the lithium niobate-on-insulator (LNOI) platform. Besides the most common way to achieve adiabaticity by slowing down the evolution of the system, the adiabaticity of a topological pump is also contingent on an effective Berry connection between instant eigenstates, which can be controlled by the selection of specific pump loops. Specifically, we develop a strategy to identify a pump loop with a minimized effective Berr

SUBMITTER: Wu S 

PROVIDER: S-EPMC11557696 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature