Journal
NANO LETTERS
Volume 20, Issue 7, Pages 5207-5213Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01499
Keywords
Topological insulator; Low-dimensional materials; Quantum spin Hall effect (QSH); Scanning tunneling microscopy (STM)
Categories
Funding
- ERC Starting grant NanoFab2D
- Hungarian Academy of Sciences, Lendulet Program [LP2017-9/2017]
- Quantum Technology National Excellence Program [2017-1.2.1-NKP-2017-00001]
- National Research, Development and Innovation Office (Hungary) [FK 125063, K-115608, KH130413, K108753]
- ELTE Excellence Program by the Hungarian Ministry of Human Capacities [1783-3/2018/FEKUTSTRAT]
- Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences
- New National Excellence Program of the Ministry for Innovation and Technology [UNKP-19-4]
- Grant Agency of the Czech Republic [18-15390S]
- NIIF
- [VEKOP-2.3.2-16-2016-00011]
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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. 2 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.
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