Signature of Large-Gap Quantum Spin Hall State in the Layered Mineral Jacutingaite
Konrád Kandrai, Péter Vancsó, Gergő Kukucska, János Koltai, György Baranka, Ákos Hoffmann, Áron Pekker, K. Kamarás, Zsolt E. Horváth, Anna Vymazalová, Levente Tapasztó, Péter Nemes‐Incze
Abstract
) 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 [Formula: see text] 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.
Topics & Concepts
Condensed matter physicsMaterials scienceSpin (aerodynamics)Quantum spin Hall effectMineralQuantum Hall effectPhysicsNanotechnologyQuantum mechanicsElectronThermodynamicsMetallurgyTopological Materials and PhenomenaAdvanced Condensed Matter PhysicsGraphene research and applications