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Topological surface states of infinitely adaptive series (Bi 2 Se 3 ) m (Bi 2 ) n : A first‐principles study
Author(s) -
Zhang JunJie,
Liu Xia,
Huang GuiQin
Publication year - 2015
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201552128
Subject(s) - surface states , series (stratigraphy) , surface (topology) , topology (electrical circuits) , topological insulator , density functional theory , coupling (piping) , electron , condensed matter physics , physics , materials science , quantum mechanics , mathematics , geometry , combinatorics , paleontology , metallurgy , biology
Abstract The surface electron structures of infinitely adaptive series (Bi2 Se3 )m (Bi2 )n films with various thicknesses and different terminated terraces are calculated from density‐functional theory by including spin–orbit coupling. Our calculations show that the evolution of the surface states from hybridization gaps for thin films to robust topological surface states for thicker films. However, the topological surface states show different Kramers point energies and dispersions for different terminations and different ratio of m : n , suggesting that the topological surface state in infinitely adaptive series (Bi2 Se3 )m (Bi2 )n can be tuned by changing the ratio of m : n or by changing termination.