Continuously Tunable 2D Gallium-Indium Alloys

POSTER

Abstract

A novel technique for achieving 2D metal layers – Confinement Heteroepitaxy (CHet) [1] – has recently been extended to metallic alloys [2]. We report here the structural energetics, electronic properties, and structural trends in CHet-based Indium/Gallium alloys, identifying trends that may generalize to other 2D metallic alloys that also form continuously tunable alloys. In particular, a rapid reduction in the superconducting transition temperature with increasing indium fraction appears to correlate to the depletion of carrier pockets that participate strongly in the superconductivity of pure 2D Gallium. 

[1] Atomically thin half-van der Waals metals enabled by confinement heteroepitaxy, doi: 10.1038/s41563-020-0631-x

[2] Tunable 2D Group-III Metal Alloys, doi: 10.1002/adma.202104265

*Funding for this work was supported by Air Force Office of Scientific Research (AFOSR) grant FA9550-19-1-0295, the National Science Foundation (NSF) under DMR-2002651 and DMR-2011839 through the Penn State MRSEC Center for Nanoscale Science, the 2D Crystal Consortium NSF Materials Innovation Platform under cooperative agreement DMR-1539916, the Singapore National Research Foundation, Prime Minister's Office, under its medium-sized center program, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy-EXC2089/1-390776260, the Empire State Development's Division of Science, Technology and Innovation (NYSTAR) through Focus Center-New York contract C150117, and Horiba corporation. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231. The electron microscopy work was funded by the US AFOSR Award FA9550-19-1-0239 and the NSERC – Natural Sciences and Eng

Publication: Tunable 2D Group-III Metal Alloys, doi: 10.1002/adma.202104265

Presenters

  • Benjamin Katz

    • Pennsylvania State University

Authors

  • Benjamin Katz

    • Pennsylvania State University

  • Vincent H Crespi

    • Pennsylvania State University

  • Siavash Rajabpour

    • Pennsylvania State University

  • Alexander Vera

    • Pennsylvania State University

  • Wen He

    • National University of Singapore

  • Margaux Lassaunière

    • University of Münster

  • Hesham El-Sherif

    • McMaster University