Observation of interband Berry phase in laser-driven crystals.

ABSTRACT: Ever since its discovery¹, the notion of the Berry phase has permeated all branches of physics and plays an important part in a variety of quantum phenomena². However, so far all its realizations have been based on a continuous evolution of the quantum state, following a cyclic path. Here we introduce and demonstrate a conceptually new manifestation of the Berry phase in light-driven crystals, in which the electronic wavefunction accumulates a geometric phase during a discrete evolution between different bands, while preserving the coherence of the process. We experimentally reveal this phase by using a strong laser field to engineer an internal interferometer, induced during less than one cycle of the driving field, which maps the phase onto the emission of higher-or

SUBMITTER: Uzan-Narovlansky AJ 

PROVIDER: S-EPMC10830408 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature