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First discovery of a natural topological insulator

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Posted March 8, 2013
The mineral Kawazulite is a natural “topological insulator,” a material that could have applica- tions in a new genre of supercomputers.Credit: American Chemical Society

The mineral Kawazulite is a natural “topological insulator,” a material that could have applications in a new genre of supercomputers.Credit: American Chemical Society

In a step toward understanding and exploiting an exotic form of matter that has been sparking excitement for potential applications in a new genre of supercomputers, scientists are reporting the first identification of a naturally occurring “topological insulator” (TI). Their report on discovery of the material, retrieved from an abandoned gold mine in the Czech Republic, appears in the ACS journal Nano Letters.

Pascal Gehring and colleagues point out that synthetic TIs, discovered only a decade ago, are regarded as a new horizon in materials science. Unlike conventional electrical insulators, which do not conduct electricity, TIs have the unique property of conducting electricity on their surface, while acting as an insulator inside. Although seemingly simple, this type of surface could allow manipulation of the spin of an electron, paving the way for development of a quantum computer. Such a computer would crunch data much faster than today’s best supercomputers.

The research team describes discovering that the mineral Kawazulite, found in the Czech gold mine and processed into nanoflakes, is a natural TI. The flakes were so small that thousands would fit inside the dot over an “i.” Based on the discovery, natural TIs may exist in other minerals, the report states. Scientists, they recall, once believed that quasi-crystals — topic of the 2011 Nobel Prize in Chemistry — were available only synthetically, but those materials recently were discovered in sky-fallen meteorites.

Source: ACS

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