Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-10-04
Phys. Rev. B 83, 085110 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 8 figures
Scientific paper
10.1103/PhysRevB.83.085110
We study the effects of spatially localized breakdown of time reversal symmetry on the surface of a topological insulator (TI) due to proximity to a helical spin density wave (HSDW). The HSDW acts like an externally applied one-dimensional periodic(magnetic) potential for the spins on the surface of the TI, rendering the Dirac cone on the TI surface highly anisotropic. The decrease of group velocity along the direction $\hat{x}$ of the applied spin potential is twice as much as that perpendicular to $\hat{x}$. At the Brillouin zone boundaries (BZB) it also gives rise to new semi-Dirac points which have linear dispersion along $\hat{x}$ but quadratic dispersion perpendicular to $\hat{x}$. The group velocity of electrons at these new semi-Dirac points is also shown to be highly anisotropic. Experiments using TI systems on multiferroic substrates should realize our predictions. We further discuss the effects of other forms of spin density wave on the surface transport property of topological insulator.
Ghosh Parag
Li Qiuzi
Sarma Sankar Das
Sau Jay D.
Tewari Sumanta
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