2018/07/31 by Bheema Lingam Chittari, Nicolas Leconte, Srivani Javvaji +1
Chemistry · Materials Science · Physics and Astronomy · #Bilayer #Bilayer graphene #Carbon Nanotubes in Composites #Chemistry #Composite material #Compression (physics) #Diamond and Carbon-based Materials Research #Graphene #Graphene research and applications #Materials science #Membrane #Nanotechnology #cond-mat.mes-hall
paper · pdf · doi:10.1088/2516-1075/aaead3
published as Electronic Structure, Volume 1, 015001 (2019) · 6 pages 3 figures
arxiv created 2018/07/31 · openalex publication_date 2018/11/20 · arxiv updated 2019/01/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract We investigate the bandwidth compression due to out of plane pressure of the moiré flatbands near charge neutrality in twisted bilayer graphene for a continuous range of small rotation angles of up to ∼ . The flatband bandwidth minima angles are found to grow linearly with interlayer coupling ω and decrease with Fermi velocity. Application of moderate pressure values of up to 2.5 GPa achievable through a hydraulic press should allow to access a flatband for angles as large as ∼ instead of ∼ at zero pressure. This reduction of the moiré pattern length for larger twist angles implies increase of the effective Coulomb interaction scale per moiré cell by about 50% and enhances roughly by a factor of ∼2 the elastic energy that resists the commensuration strains due to the moiré pattern. Our results suggest that application of pressure on twisted bilayer graphene nanodevices through a hydraulic press will notably facilitate the device preparation efforts required for exploring the ordered phases near magic angle flatbands.