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• W2055450957 abstract "We investigate the effect of potential barriers in the form of step edges on the scattering properties of Bi$_2$Se$_3$(111) topological surface states by means of large-scale ab-initio transport simulations. Our results demonstrate the suppression of perfect backscattering, while all other scattering processes, which do not entail a complete spin and momentum reversal, are allowed. Furthermore, we find that the spin of the surface state develops an out of plane component as it traverses the barrier. Our calculations reveal the existence of quasi-bound states in the vicinity of the surface barriers, which appear in the form of an enhanced density of states in the energy window corresponding to the topological state. For double barriers we demonstrate the formation of quantum well states. To complement our first-principles results we construct a two-dimensional low-energy effective model and show that band bending plays a significant role in the scattering process. Our findings are discussed in the context of a number of recent experimental works." @default.
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• W2055450957 date "2014-11-24" @default.
• W2055450957 modified "2023-10-03" @default.
• W2055450957 title "<i>Ab initio</i>transport across bismuth selenide surface barriers" @default.
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• W2055450957 doi "https://doi.org/10.1103/physrevb.90.205431" @default.
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