Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-08-15
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Added a page of additional text and refined the presentation. Main content unchanged
Scientific paper
When topological insulators possess rotational symmetry their spin lifetime is tied to the scattering time. We show that in anisotropic TIs this tie can be broken and the spin lifetime can be very large. Two different mechanisms can obtain spin conduction over long distances. The first is tuning the Hamiltonian to conserve a spin operator $\cos \phi \, \sigma_x + \sin \phi \, \sigma_y$, while the second is tuning the Fermi energy to be near a local extremum of the energy dispersion. Both mechanisms can produce persistent spin helices. We report spin lifetimes and spin diffusion equations.
Dai Xian-Xin
Fang Zhong
Kettemann Stefan
Sacksteder IV Vincent E.
Wu Quan-Sheng
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