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  Topological Floquet engineering of twisted bilayer graphene

Topp, G., Jotzu, G., McIver, J. W., Xian, L. D., Rubio, A., & Sentef, M. A. (2019). Topological Floquet engineering of twisted bilayer graphene. Physical Review Research, 1(2): 023031. doi:10.1103/PhysRevResearch.1.023031.

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PhysRevResearch.1.023031.pdf (Verlagsversion), 3MB
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PhysRevResearch.1.023031.pdf
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
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https://arxiv.org/abs/1906.12135 (Preprint)
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https://dx.doi.org/10.1103/PhysRevResearch.1.023031 (Verlagsversion)
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 Urheber:
Topp, G.1, Autor           
Jotzu, G.2, Autor           
McIver, J. W.2, Autor           
Xian, L. D.3, Autor           
Rubio, A.3, 4, Autor           
Sentef, M. A.1, Autor           
Affiliations:
1Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_3012828              
2Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Computational Quantum Physics (CCQ),The Flatiron Institute, ou_persistent22              

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 Zusammenfassung: We investigate the topological properties of Floquet-engineered twisted bilayer graphene above the so-called magic angle driven by circularly polarized laser pulses. Employing a full Moiré-unit-cell tight-binding Hamiltonian based on first-principles electronic structure, we show that the band topology in the bilayer, at twisting angles above 1.05∘, essentially corresponds to the one of single-layer graphene. However, the ability to open topologically trivial gaps in this system by a bias voltage between the layers enables the full topological phase diagram to be explored, which is not possible in single-layer graphene. Circularly polarized light induces a transition to a topologically nontrivial Floquet band structure with the Berry curvature analogous to a Chern insulator. Importantly, the twisting allows for tuning electronic energy scales, which implies that the electronic bandwidth can be tailored to match realistic driving frequencies in the ultraviolet or midinfrared photon-energy regimes. This implies that Moiré superlattices are an ideal playground for combining twistronics, Floquet engineering, and strongly interacting regimes out of thermal equilibrium.

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Sprache(n): eng - English
 Datum: 2019-06-282019-09-27
 Publikationsstatus: Online veröffentlicht
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: arXiv: 1906.12135
DOI: 10.1103/PhysRevResearch.1.023031
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Projektname : Discussions with S. A. Sato are gratefully acknowledged. G.E.T. and M.A.S. acknowledge financial support by the DFG through the Emmy Noether program (No. SE 2558/2-1). This work was supported by the European Research Council (No. ERC-2015-AdG694097). The Flatiron Institute is a division of the Simons Foundation.
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Titel: Physical Review Research
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: College Park, Maryland, United States : American Physical Society (APS)
Seiten: - Band / Heft: 1 (2) Artikelnummer: 023031 Start- / Endseite: - Identifikator: ISSN: 2643-1564
CoNE: https://pure.mpg.de/cone/journals/resource/2643-1564