期刊
NANO LETTERS
卷 19, 期 8, 页码 4934-4940出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b00986
关键词
Twisted bilayer; multiflat bands; strong correlations; Mott insulator; topological superconductor; ab initio calculation
类别
资金
- European Research Council [ERC-2015-AdG694097]
- European Union [709382]
- Deutsche Forschungsgemeinschaft through the Emmy Noether program [KA 3360/2-1]
- RWTH Aachen University [prep0010]
- NIH [1G20RR030893-01]
- New York State Empire State Development, Division of Science Technology and Innovation (NYSTAR) [C090171]
- Marie Curie Actions (MSCA) [709382] Funding Source: Marie Curie Actions (MSCA)
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.
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