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Tuesday, October 23 2018

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Topological insulators (TIs) are a new quantum state of matter characterized by metallic surface states populated by massless Dirac fermions. One of the most striking properties is that of spin-momentum locking - the spin of the TI surface state lies in-plane, and is locked at right angle to carrier momentum. This enables the direct control and conversion between its charge and spin, where an unpolarized charged current should produce a spin accumulation, and conversely the electrical injection of spin polarized electrons should generate a charge accumulation.

Source codes are increasingly important for the advancement of science in general and astrophysics in particular. Journal articles detail the general logic behind new results and ideas, but often the source codes that enable these results remain hidden from public view, decreasing the transparency and integrity of the research. The Astrophysics Source Code Library (ASCL, ascl.net) is a registry of scientist-written software used in astronomy research.