Based on first-principles calculations, we studied the topological edge states in zigzag chlorinated stanene nanoribbon. 
first-principles
Dual Dirac points and odd-even oscillated energy gap in zigzag chlorinated stanene nanoribbon.Stanene has been predicted to be a two-dimensional topological insulator, providing an ideal platform for the realization of quantum spin Hall effect even at room temperature.  Based on first-principles calculations, we studied the topological edge states in zigzag chlorinated stanene nanoribbon.  One Dirac point is localized at the edges and emerges in a narrow nanoribbon, while another is widespread and can only be found in a wide nanoribbon due to the coupling of two opposite edges.  At the localized Dirac point, there is an interesting odd-even oscillated energy gap with the change of the width of nanoribbon.  Our calculations may be helpful for the potential applications of tin-based topological nanoribbons in nanodevices.
nanoribbon