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Onset of Bloch oscillations in the almost-strong-field regime
In the field of high-order harmonic generation from solids, the electron motion typically exceeds the edge of the first Brillouin zone. In conventional nonlinear optics, on the other hand, the excursion of band electrons is negligible. Here, we investigate the transition from conventional nonlinear...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9747800/ https://www.ncbi.nlm.nih.gov/pubmed/36513671 http://dx.doi.org/10.1038/s41467-022-35401-3 |
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author | Reislöhner, Jan Kim, Doyeong Babushkin, Ihar Pfeiffer, Adrian N. |
author_facet | Reislöhner, Jan Kim, Doyeong Babushkin, Ihar Pfeiffer, Adrian N. |
author_sort | Reislöhner, Jan |
collection | PubMed |
description | In the field of high-order harmonic generation from solids, the electron motion typically exceeds the edge of the first Brillouin zone. In conventional nonlinear optics, on the other hand, the excursion of band electrons is negligible. Here, we investigate the transition from conventional nonlinear optics to the regime where the crystal electrons begin to explore the first Brillouin zone. It is found that the nonlinear optical response changes abruptly already before intraband currents due to ionization become dominant. This is observed by an interference structure in the third-order harmonic generation of few-cycle pulses in a non-collinear geometry. Although approaching Keldysh parameter γ = 1, this is not a strong-field effect in the original sense, because the iterative series still converges and reproduces the interference structure. The change of the nonlinear interband response is attributed to Bloch motion of the reversible (or transient or virtual) population, similar to the Bloch motion of the irreversible (or real) population which affects the intraband currents that have been observed in high-order harmonic generation. |
format | Online Article Text |
id | pubmed-9747800 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-97478002022-12-15 Onset of Bloch oscillations in the almost-strong-field regime Reislöhner, Jan Kim, Doyeong Babushkin, Ihar Pfeiffer, Adrian N. Nat Commun Article In the field of high-order harmonic generation from solids, the electron motion typically exceeds the edge of the first Brillouin zone. In conventional nonlinear optics, on the other hand, the excursion of band electrons is negligible. Here, we investigate the transition from conventional nonlinear optics to the regime where the crystal electrons begin to explore the first Brillouin zone. It is found that the nonlinear optical response changes abruptly already before intraband currents due to ionization become dominant. This is observed by an interference structure in the third-order harmonic generation of few-cycle pulses in a non-collinear geometry. Although approaching Keldysh parameter γ = 1, this is not a strong-field effect in the original sense, because the iterative series still converges and reproduces the interference structure. The change of the nonlinear interband response is attributed to Bloch motion of the reversible (or transient or virtual) population, similar to the Bloch motion of the irreversible (or real) population which affects the intraband currents that have been observed in high-order harmonic generation. Nature Publishing Group UK 2022-12-13 /pmc/articles/PMC9747800/ /pubmed/36513671 http://dx.doi.org/10.1038/s41467-022-35401-3 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Reislöhner, Jan Kim, Doyeong Babushkin, Ihar Pfeiffer, Adrian N. Onset of Bloch oscillations in the almost-strong-field regime |
title | Onset of Bloch oscillations in the almost-strong-field regime |
title_full | Onset of Bloch oscillations in the almost-strong-field regime |
title_fullStr | Onset of Bloch oscillations in the almost-strong-field regime |
title_full_unstemmed | Onset of Bloch oscillations in the almost-strong-field regime |
title_short | Onset of Bloch oscillations in the almost-strong-field regime |
title_sort | onset of bloch oscillations in the almost-strong-field regime |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9747800/ https://www.ncbi.nlm.nih.gov/pubmed/36513671 http://dx.doi.org/10.1038/s41467-022-35401-3 |
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