Observation of interband Berry phase in laser-driven crystals.
Nature
; 626(7997): 66-71, 2024 Feb.
Article
en En
| MEDLINE
| ID: mdl-38233521
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-order harmonics. Our work provides an opportunity for the study of geometric phases, leading to a variety of observations in light-driven topological phenomena and attosecond solid-state physics.
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Base de datos:
MEDLINE
Idioma:
En
Revista:
Nature
Año:
2024
Tipo del documento:
Article
País de afiliación:
Israel