%0 Journal Article
%T Termination dependent topological surface states of the natural superlattice phase Bi$_4$Se$_3$
%A Q. D. Gibson
%A L. M. Schoop
%A A. P. Weber
%A Huiwen Ji
%A S. Nadj-Perge
%A I. K. Drozdov
%A H. Beidenkopf
%A J. T. Sadowski
%A A. Fedorov
%A A. Yazdani
%A T. Valla
%A R. J. Cava
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevB.88.081108
%X We describe the topological surface states of Bi$_4$Se$_3$, a compound in the infinitely adaptive Bi$_2$-Bi$_2$Se$_3$ natural superlattice phase series, determined by a combination of experimental and theoretical methods. Two observable cleavage surfaces, terminating at Bi or Se, are characterized by angle resolved photoelectron spectroscopy and scanning tunneling microscopy, and modeled by ab-initio density functional theory calculations. Topological surface states are observed on both surfaces, but with markedly different dispersions and Kramers point energies. Bi$_4$Se$_3$ therefore represents the only known compound with different topological states on differently terminated surfaces.
%U http://arxiv.org/abs/1305.3558v3