Helical Dirac fermion

A Helical Dirac fermion is a charge carrier that behaves as a massless relativistic particle with its intrinsic spin locked to its translational momentum.

References

• Hsieh, D.; et al. (1101). "A tunable topological insulator in the spin helical Dirac transport regime". Nature. 460 (7259): 1101–5. arXiv:1001.1590. Bibcode:2009Natur.460.1101H. doi:10.1038/nature08234. PMID 19620959.