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. 2014 Jul 11;5:4144. doi: 10.1038/ncomms5144

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Calcuated energy bands for the undistorted (a) and distorted (b) structures of Bi₂Se₃, corresponding to the Γ point optical mode associated with the inversion breaking dispacement of Bi atom along z-axis. Illustrated are the splitting of double degenerate bands as well as renormalization of their width that result in a large EPI.