Signature of Large-Gap Quantum Spin Hall State in the Layered Mineral Jacutingaite

Konrád Kandrai, Péter Vancsó, Gergö Kukucska, János Koltai, György Baranka, Hoffmann Ákos Hoffmann, Pekker Áron Pekker, Katalin Kamarás, Zsolt E. Horváth, Anna Vymazalová, Levente Tapasztó, Péter Nemes-Incze

Research output: Contribution to journalArticle

Abstract

Quantum spin Hall (QSH) insulators host edge states, where the helical locking of spin and momentum suppresses backscattering of charge carriers, promising applications from low-power electronics to quantum computing. A major challenge for applications is the identification of large gap QSH materials, which would enable room temperature dissipationless transport in their edge states. Here we show that the layered mineral jacutingaite (Pt2HgSe3) is a candidate QSH material, realizing the long sought-after Kane-Mele insulator. Using scanning tunneling microscopy, we measure a band gap in excess of 100 meV and identify the hallmark edge states. By calculating the Z2 invariant, we confirm the topological nature of the gap. Jacutingaite is stable in air, and we demonstrate exfoliation down to at least two layers and show that it can be integrated into heterostructures with other two-dimensional materials. This adds a topological insulator to the 2D quantum material library.

Original languageEnglish
Pages (from-to)5207-5213
Number of pages7
JournalNano letters
Volume20
Issue number7
DOIs
Publication statusPublished - Jul 8 2020

Keywords

  • Low-dimensional materials
  • Quantum spin Hall effect (QSH)
  • Scanning tunneling microscopy (STM)
  • Topological insulator

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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  • Cite this

    Kandrai, K., Vancsó, P., Kukucska, G., Koltai, J., Baranka, G., Ákos Hoffmann, H., Áron Pekker, P., Kamarás, K., Horváth, Z. E., Vymazalová, A., Tapasztó, L., & Nemes-Incze, P. (2020). Signature of Large-Gap Quantum Spin Hall State in the Layered Mineral Jacutingaite. Nano letters, 20(7), 5207-5213. https://doi.org/10.1021/acs.nanolett.0c01499