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  Pseudospin-selective Floquet band engineering in black phosphorus

Zhou, S., Bao, C., Fan, B., Zhou, H., Gao, Q., Zhong, H., et al. (2023). Pseudospin-selective Floquet band engineering in black phosphorus. Nature, 614(7946), 75-80. doi:10.1038/s41586-022-05610-3.

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News & Views article "Light tailors the electronic properties of a model semiconductor" by A. Crepaldi
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 Urheber:
Zhou, S.1, 2, Autor
Bao, C.1, 2, Autor
Fan, B.1, 2, Autor
Zhou, H.3, Autor
Gao, Q.1, 2, Autor
Zhong, H.1, 2, Autor
Lin, T.1, 2, Autor
Liu, H.3, 4, Autor
Yu, P.1, 2, 5, Autor
Tang, P.6, 7, 8, Autor           
Meng, S.3, 4, Autor
Duan, W.1, 2, 5, Autor
Zhou, S.1, 2, 5, Autor
Affiliations:
1Department of Physics, Tsinghua University, Beijing, ou_persistent22              
2State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University, Beijing, ou_persistent22              
3Institute of Physics, Chinese Academy of Sciences, Beijing, ou_persistent22              
4Songshan Lake Materials Laboratory, Dongguan, ou_persistent22              
5Frontier Science Center for Quantum Information, Beijing, ou_persistent22              
6School of Materials Science and Engineering, Beihang University, Beijing, ou_persistent22              
7Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
8Center for Free-Electron Laser Science, ou_persistent22              

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 Zusammenfassung: Time-periodic light field has emerged as a control knob for manipulating quantum states in solid-state materials1,2,3, cold atoms4 and photonic systems5 through hybridization with photon-dressed Floquet states6 in the strong-coupling limit, dubbed Floquet engineering. Such interaction leads to tailored properties of quantum materials7,8,9,10,11, for example, modifications of the topological properties of Dirac materials12,13 and modulation of the optical response14,15,16. Despite extensive research interests over the past decade3,8,17,18,19,20, there is no experimental evidence of momentum-resolved Floquet band engineering of semiconductors, which is a crucial step to extend Floquet engineering to a wide range of solid-state materials. Here, on the basis of time and angle-resolved photoemission spectroscopy measurements, we report experimental signatures of Floquet band engineering in a model semiconductor, black phosphorus. On near-resonance pumping at a photon energy of 340–440 meV, a strong band renormalization is observed near the band edges. In particular, light-induced dynamical gap opening is resolved at the resonance points, which emerges simultaneously with the Floquet sidebands. Moreover, the band renormalization shows a strong selection rule favouring pump polarization along the armchair direction, suggesting pseudospin selectivity for the Floquetband engineering as enforced by the lattice symmetry. Our work demonstrates pseudospin-selective Floquet band engineering in black phosphorus and provides important guiding principles for Floquet engineering of semiconductors.

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Sprache(n): eng - English
 Datum: 2021-12-132022-11-302023-02-012023-02-02
 Publikationsstatus: Erschienen
 Seiten: 6
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1038/s41586-022-05610-3
arXiv: 2302.00604
 Art des Abschluß: -

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Projektname : We thank N.L. Wang, R.-B. Liu, D. Sun and Y.H. Wang for useful discussions. This work is supported by the National Key R&D Program of China (grant no. 2021YFA1400100), the National Natural Science Foundation of China (grant nos. 11725418, 12234011 and 11427903) and National Key R&D Program of China (grant nos. 2020YFA0308800 and 2016YFA0301004). P.Y. and W.D. acknowledge the support of the Basic Science Center Project of NSFC (grant no. 51788104). S.M. acknowledges supports from Ministry of Science and Technology (grant no. 2021YFA1400201), National Natural Science Foundation of China (grant no. 12025407) and Chinese Academy of Sciences (grant no. YSBR047).
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Quelle 1

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Titel: Nature
  Kurztitel : Nature
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: London : Nature Publishing Group
Seiten: - Band / Heft: 614 (7946) Artikelnummer: - Start- / Endseite: 75 - 80 Identifikator: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238