Authors:

William Christophe Bultman

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About Paper:

Prior research has primarily focused on discovering quantum phenomena such as superconductivity and correlated insulating states in moire superlattices, those being twisted bilayer graphene and WSe2 of angles less than 5.0°. Much is yet to be discovered in regards to high twist angle bilayer WSe2, as well thicker layers of twisted WSe2, such as trilayer twisted WSe2 and its quantum properties. Further insights into the quantum properties of twisted bilayer and trilayer WSe2 puts research closer to understanding moire materials and their utility through superconductivity among other quantum phenomena. However, obtaining the large-area pristine monolayer WSe2- the key ingredient in our twisted layer device- deems challenging using the standard tape exfoliation method. We systematically study effect of a few tuning parameters on the yield of WSe2 exfoliation. We find maximized yield at a tape peel-off angle of 135° while the tension in transfer tapes minimized. The enhanced yield allows us to build twisted bilayer and trilayer WSe2 devices where we seek to detect superconducting and/or correlated insulating states through electrical transport measurement at low temperature. Keywords: 2D Materials; Condensed Matter Physics; Materials Science; Quantum; TMD

Source:

Purdue University / 2025

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Co-authors:

William Christophe Bultman