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Quantized Edged States in Van der Waals injection-molded bismuth

ORAL

Abstract

Confinement of quantum materials reduces bulk contributions and isolates surface and edge states that are ideal for transport studies. Helical modes have been directly observed in bulk bismuth surfaces and hinges using STM and ARPES. In this work, we present transport measurements from single crystal, ultra-flat bismuth, grown inbetween atomically-flat van der Waals materials. We melt and inject bismuth into SiO2 molds lined with hexagonal boron nitride (hBN). The resulting bismuth crystals are ten times larger than those produced with our previous vdW-molding method [1]. Both injection molding and vdW-molding techniques reveal quantum oscillations and metallic behavior at low temperatures. Additionally, multi-terminal measurements show large non-local signals, indicative of edge state contributions at high magnetic fields. We will also discuss the results of dual gating on injection-molded bismuth surfaces. Furthermore, we have extended the injection-molding method to grow other high-quality thin crystals, such as tin, indium, and tellurium, to study their properties in the ultrathin and ultraflat limits.

[1] Chen, L., Wu, A.X., Tulu, N. et al. Exceptional electronic transport and quantum oscillations in thin bismuth crystals grown inside van der Waals materials. Nat. Mater. 23, 741–746 (2024). https://doi.org/10.1038/s41563-024-01894-0

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Presenters

  • Amy X Wu

    University of California, Irvine

Authors

  • Amy X Wu

    University of California, Irvine

  • Vinh Tran

    University of California, Irvine, Department of Physics and Astronomy, California State University, Long Beach

  • Laisi Chen

    University of California, Irvine

  • Ziyu Feng

    University of California, Irvine

  • Vijay R Kumar

    University of California, Irvine, University of California Irvine

  • Kenji Watanabe

    National Institute for Materials Science, NIMS, Research Center for Functional Materials, National Institute for Materials Science, Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, Research Center for Functional Materials, National Institute of Material Science, Tsukuba, Japan, National Institute of Materials Science, Advanced Materials Laboratory, National Institute for Materials Science

  • Takashi Taniguchi

    National Institute for Materials Science, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba, Japan, Advanced Materials Laboratory, National Institute for Materials Science

  • Javier D Sanchez-Yamagishi

    University of California, Irvine