Authors:

Sagarika Menon

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About Paper:

First proposed in theory and then launched as an exciting new field with the experimental discovery of gate-tunable correlated insulator and superconductivity in "Magic Angle" Twisted Bilayer Graphene (MATBG), twistronics examines the impact of a twist angle between the lattice interfaces of stacked 2D materials on the electronic properties of the resulting structure. However, most twistronics samples so far have been created using scotch-tape exfoliated 2D materials, yielding samples limited to only a few tens of micrometers in size. Meanwhile, Molecular Beam Epitaxy (MBE) can produce high-quality thin films at the wafer scale, offering a promising route to advance both fundamental studies and practical applications for twistronics in a scalable fashion. With MBE, however, it is challenging to manipulate and stack those thin films since they are firmly attached to the substrate on which they were grown. Therefore, we need a method to reproducibly separate MBE films from the substrate without introducing tears or other imperfections, to use them for twistronics. We endeavor to build upon a recently demonstrated manual procedure that can peel wafer-scale MBE films, creating a motorized machine that performs this process in a more consistent and reproducible manner. With this approach, we will be able to integrate MBE-grown materials into twistronics research and study the electronic properties of these structures at the wafer scale, compare these results with twistronics samples produced with scotch-tape-exfoliated flakes, and bridge the gap between discoveries in fundamental science and scalable device applications. Keywords: 2D Materials; Wafer Scale Synthesis; Twistronics

Source:

Purdue University / 2025

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Co-authors:

Sagarika Menon