121 research outputs found
Anomalous Finite Size Effects on Surface States in the Topological Insulator BiSe
We study how the surface states in the strong topological insulator
BiSe are influenced by finite size effects, and compare our results
with those recently obtained for 2D topological insulator HgTe. We demonstrate
two important distinctions: \textit{(i)} contrary to HgTe, the surface-states
in BiSe display a remarkable robustness towards decreasing the width
down to a few nm, thus ensuring that the topological surface states remain
intact, and \textit{(ii)} the gapping due to the hybridization of the surface
states features an oscillating exponential decay as a function of in
BiSe in sharp contrast to HgTe. Our findings suggest that BiSe
is suitable for nanoscale applications in quantum computing or spintronics.
Also, we propose a way to experimentally detect both of the predicted effects.Comment: 5 pages, 4 figures. References added. Accepted for publication in
Phys. Rev.
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