Unveiling the Miniband Structure of Graphene Moire Superlattices via Gate-Dependent Terahertz Photocurrent Spectroscopy.

ABSTRACT: Moiré superlattices formed at the interface between stacked 2D atomic crystals offer limitless opportunities to design materials with widely tunable properties and engineer intriguing quantum phases of matter. However, despite progress, precise probing of the electronic states and tantalizingly complex band textures of these systems remain challenging. Here, we present gate-dependent terahertz photocurrent spectroscopy as a robust technique to detect, explore, and quantify intricate electronic properties in graphene moiré superlattices. Specifically, using terahertz light at different frequencies, we demonstrate distinct photocurrent regimes, evidencing the presence of avoided band crossings and tiny (∼1 to 20 meV) inversion-breaking global and local energy gaps in the miniband structure o

SUBMITTER: Delgado-Notario JA 

PROVIDER: S-EPMC12333420 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature