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Stanen is a competitor of graphene

29.11.2013

A two-dimensional layer of tin (stanene) can show an even higher level of charge mobility, and these properties appear at room temperature. Details with reference to an article in Physical Review Letters are given by the Stanford National Accelerator Laboratory.

Scientists from Stanford University, together with colleagues from Germany (Max Planck Institute for Solid State Physical Chemistry) and China (Tsinghua University), performed Ab initio calculations. This is a special class of calculations in which the results are obtained by calculations (usually quite complex and cumbersome) directly from the principles of quantum mechanics.

Simulation of a two-dimensional layer of tin atoms made it possible to establish that the spin Hall effect should be observed in such a material and, in addition, flat tin should be a topological insulator. The combination of these properties makes stanen, as scientists called the theoretically predicted form of tin, a promising material for use in microelectronics.

Topological insulators are materials that conduct current only in a thin near-surface layer. This phenomenon is fundamentally different from the skin effect (alternating current flows mainly near the surface of the conductor) and can be observed in insulators. In the case of flat tin, physicists say that the current through the stanen film will only pass along its edges.

Stanen, according to the scientists who predicted it, can be used to create microelectronic devices. In particular, the high mobility of charges will reduce the power consumption of microcircuits, and the quantum spin Hall effect can be applied in spintronics: computing systems that operate not only with charge, but also with spin currents.

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