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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.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-E991-2 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-E992-1
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1906.12135.pdf (Preprint), 2MB
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1906.12135.pdf
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https://arxiv.org/abs/1906.12135 (Preprint)
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 Creators:
Topp, G.1, Author              
Jotzu, G.2, Author              
McIver, J. W.2, Author              
Xian, L. D.3, Author              
Rubio, A.3, 4, Author              
Sentef, M. A.1, Author              
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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 Abstract: We investigate the topological properties of Floquet-engineered twisted bilayer graphene above the 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 of 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 mid-infrared 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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Language(s): eng - English
 Dates: 2019-06-28
 Publication Status: Published online
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Method: No review
 Identifiers: arXiv: 1906.12135
 Degree: -

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