Multiflat Bands and Strong Correlations in Twisted Bilayer BoronNitride: Doping-Induced Correlated Insulator and Superconductor
| Autor: | Massimo Altarelli, Angel Rubio, Lede Xian, Dante M. Kennes, Nicolas Tancogne-Dejean |
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| Přispěvatelé: | European Commission, European Research Council, German Research Foundation |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Letter excitons multiflat bands Stacking topological superconductor Bioengineering Insulator (electricity) 02 engineering and technology twisted bilayer chemistry.chemical_compound symbols.namesake strong correlations General Materials Science Superconductivity ab initio calculation Condensed matter physics Mechanical Engineering Bilayer Mott insulator Doping graphene General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics chemistry Boron nitride symbols van der Waals force Topological superconducto 0210 nano-technology |
| Zdroj: | Addi. Archivo Digital para la Docencia y la Investigación instname Nano Letters Digital.CSIC. Repositorio Institucional del CSIC |
| Popis: | Two-dimensional materials, obtained by van der Waals stacking of layers, are fascinating objects of contemporary condensed matter research, exhibiting a variety of new physics. Inspired by the breakthroughs of twisted bilayer graphene (TBG), we demonstrate that twisted bilayer boron nitride (TBBN) is an even more exciting novel system that turns out to be an excellent platform to realize new correlated phases and phenomena; exploration of its electronic properties shows that in contrast to TBG in TBBN multiple families of 2,4, and 6-fold degenerate flat bands emerge without the need to fine tune close to a “magic angle”, resulting in dramatic and tunable changes in optical properties and exciton physics, and providing an additional platform to study strong correlations. Upon doping, unforeseen new correlated phases of matter (insulating and superconducting) emerge. TBBN could thus provide a promising experimental platform, insensitive to small deviations in the twist angle, to study novel exciton condensate and spatial confinement physics, and correlations in two dimensions. This work was supported by the European Research Council (ERC-2015-AdG694097). The Flatiron Institute is a division of the Simons Foundation. L.X. acknowledges the European Unions Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant Agreement number 709382 (MODHET). D.M.K. acknowledges funding from the Deutsche Forschungsgemeinschaft through the Emmy Noether program (KA 3360/2-1). |
| Databáze: | OpenAIRE |
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