Signature of large-gap quantum spin Hall state in the layered mineral jacutingaite

Abstract

Quantum spin Hall (QSH) insulators are materials that feature an insulating bulk and host edge states protected by time-reversal symmetry. The helical locking of spin and momentum in these states 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 (Pt${}_2$HgSe${}_3$) is a candidate QSH material, realizing the long sought after the Kane-Mele insulator. Using scanning tunneling microscopy, we measure a band gap of 110 meV, above room temperature, and identify the hallmark edge states. By calculating the ${\mathbb{Z}}_2$ invariant, we confirm the topological nature of the gap. Being a layered mineral, it is stable in air and can be thinned down to a few atomic layers by mechanical exfoliation. Furthermore, we demonstrate that it can be integrated into heterostructures with other two-dimensional materials. This adds a topological insulator to the 2D quantum material library, greatly expanding the possibilities for tuning 2D electron systems using stacks of layered materials.

References in corpus (39)

• Topological Insulators
• Van der Waals heterostructures
• Quantum Spin Hall Effect in Graphene
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
• Two-dimensional materials from high-throughput computational exfoliation of experimentally known compounds
• The (High Quality) Topological Materials In The World
• Topological Surface States Protected From Backscattering by Chiral Spin Texture
• Bismuthene on a SiC Substrate: A Candidate for a New High-Temperature Quantum Spin Hall Paradigm
• Realization of Quantum Spin Hall State in Monolayer 1T'-WTe2
• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
• The hot pick-up technique for batch assembly of van der Waals heterostructures
• Spin-Orbit Proximity Effect in Graphene
• Topological Phases in Two-Dimensional Materials: A Brief Review
• Strong interface-induced spin-orbit coupling in graphene on WS2
• One-dimensional Topological Edge States of Bismuth Bilayers
• Majorana corner modes in a high-temperature platform
• Observation of topological states residing at step edges of WTe2
• Origin and magnitude of 'designer' spin-orbit interaction in graphene on semiconducting transition metal dichalcogenides
• Quantum-spin-Hall insulator with a large gap: single-layer 1T' WSe${}_2$
• Observation of Topologically Protected States at Crystalline Phase Boundaries in Single-layer WSe2
• Experimental evidence of large-gap two-dimensional topological insulator on the surface of ZrTe5
• Sub-nm wide electron channels protected by topology
• Graphene-based topological insulator with an intrinsic bulk band gap above room temperature
• Prediction of a large-gap and switchable Kane-Mele quantum spin Hall insulator
• Tomonaga-Luttinger liquid in the edge channels of a quantum spin Hall insulator
• Electron quantum metamaterials in van der Waals heterostructures
• New Family of Robust 2D Topological Insulators in van der Waals Heterostructures
• Bulk and surface electronic structure of the dual-topology semimetal Pt2HgSe3
• Failure of conductance quantization in two-dimensional topological insulators due to non-magnetic impurities
• Visualizing topological edge states of single and double bilayer Bi supported on multibilayer Bi(111) films
• Dual topology in Jacutingaite Pt${}_2$HgSe${}_3$
• Mass inversion in graphene by proximity to dichalcogenide monolayer
• Emergent dual topology in the three-dimensional Kane-Mele Pt${}_2$HgSe${}_3$
• Unconventional superconductivity in a doped quantum spin Hall insulator
• Growth and Thermo-driven Crystalline Phase Transition of Metastable Monolayer 1T'-WSe2 Thin Film
• Spin-orbit interaction in Pt or Bi2Te3 nanoparticle-decorated graphene realized by a nanoneedle method
• Electronic Structure of the Dark Surface of the Weak Topological Insulator Bi14Rh3I9

Cited by in corpus (17)

• Jacutingaite-family: a class of topological materials
• Room-temperature quantum spin Hall phase in laser-patterned few-layer 1T'- MoS2
• Second-Order Topological Insulator in van der Waals Heterostructures of CoBr${}_2$/Pt${}_2$HgSe${}_3$/CoBr${}_2$
• Probing topological phases in a perturbed Kane-Mele model via RKKY interaction: Application to monolayer jacutingaite Pt${}_2$HgSe${}_3$
• Switchable large-gap quantum spin Hall state in two-dimensional MSi${}_2$Z${}_4$ materials class
• Theory of Glide Symmetry Protected Helical Edge States in WTe${}_2$ Monolayer
• Transport features of topological corner states in honeycomb lattice with multihollow structure
• Gate-tunable imbalanced Kane-Mele model in encapsulated bilayer jacutingaite
• Bulk-boundary-transport correspondence of the second-order topological insulators
• Magnetic transitions in the 1-D chain compounds NdPd5Ge3 and NdPt5Ge3
• Realization of Kane-Mele Model in $X{\mathbf{N}}_4$-Embedded Graphene ($X$=Pt, Ir, Rh, Os)
• Pressure-induced Superconductivity in dual-topological semimetal Pt2HgSe3
• Non-trivial topology in rare-earth monopnictides from dimensionality reduction
• Exploring Topological Transport in Pt${}_2$HgSe${}_3$ Nanoribbons: Insights for Spintronic Device Integration
• Superconductivity in doped planar Dirac insulators: A renormalization group study
• Designing Extremely Low-Power Topological Transistors with 1T'-MoS2 and HZO for Cryogenic Applications
• Floquet engineering of spin-valley selective transport in jacutingaite