Authors:

Madeleine Huang Spark

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About Paper:

Two-dimensional (2D) superconductors offer a rich platform for exploring exotic electronic phenomena, yet their electrical properties in the ultrathin regime remain largely unexplored due to fabrication challenges. In this project, we investigate the 2D limit of Fe(TeSe), a bulk iron-based superconductor, by isolating monolayers through gold-assisted mechanical exfoliation. Due to the air sensitivity and instability of Fe(TeSe) in its monolayer form, we are developing van der Waals heterostructures that cap the Fe(TeSe) with protective layers of graphene and hexagonal boron nitride (hBN). To achieve this, we test multiple dry transfer methods-including polycarbonate (PC) and polypropylene carbonate (PPC) film stamps-with a focus on minimizing thermal exposure to preserve the integrity of the Fe(TeSe) layer. Once fabricated, these heterostructures will allow us to probe potential superconducting proximity effects in graphene at temperatures below the critical temperature of Fe(TeSe). Our work aims to establish a reliable platform for measuring the electronic properties of fragile 2D superconductors and exploring their interactions with adjacent materials. Keywords: 2D Materials; Dry Transfer; Mechanical Exfoliation; Superconductivity

Source:

Purdue University / 2025

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Co-authors:

Madeleine Huang Spark