Observation of interband Berry phase in laser-driven crystals

Ayelet J. Uzan-Narovlansky (), Lior Faeyrman, Graham G. Brown, Sergei Shames, Vladimir Narovlansky, Jiewen Xiao, Talya Arusi-Parpar, Omer Kneller, Barry D. Bruner, Olga Smirnova, Rui E. F. Silva, Binghai Yan, Álvaro Jiménez-Galán, Misha Ivanov and Nirit Dudovich ()
Additional contact information
Ayelet J. Uzan-Narovlansky: Weizmann Institute of Science
Lior Faeyrman: Weizmann Institute of Science
Graham G. Brown: Max-Born-Institut
Sergei Shames: Weizmann Institute of Science
Vladimir Narovlansky: Princeton University
Jiewen Xiao: Weizmann Institute of Science
Talya Arusi-Parpar: Weizmann Institute of Science
Omer Kneller: Weizmann Institute of Science
Barry D. Bruner: Weizmann Institute of Science
Olga Smirnova: Max-Born-Institut
Rui E. F. Silva: Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC)
Binghai Yan: Weizmann Institute of Science
Álvaro Jiménez-Galán: Max-Born-Institut
Misha Ivanov: Max-Born-Institut
Nirit Dudovich: Weizmann Institute of Science

Nature, 2024, vol. 626, issue 7997, 66-71

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41586-023-06828-5

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