STM imaging of a bound state along a step on the surface of the topological insulator Bi_{2}Te_{3}
Abstract
We present a detailed study of the local density of states (LDOS) associated with the surfacestate band near a step edge of the strong topological insulator Bi_{2}Te_{3} and reveal a onedimensional bound state that runs parallel to the step edge and is bound to it at some characteristic distance. This bound state is clearly observed in the bulk gap region, while it becomes entangled with the oscillations of the warped surface band at high energy [Alpichshev , Phys. Rev. Lett.PRLTAO0031900710.1103/PhysRevLett.104.016401 104, 016401 (2010)], and with the valenceband states near the Dirac point. We obtain excellent fits to theoretical predictions [Alpichshev , 2011] that properly incorporate the threedimensional nature of the problem to the surface state [Zhang , Nat. Phys.PRLTAO1745247310.1038/nphys1270 5, 438 (2009)]. Fitting the data at different energies, we can recalculate the LDOS originating from the Dirac band without the contribution of the bulk bands or incoherent tunneling effects.
 Publication:

Physical Review B
 Pub Date:
 July 2011
 DOI:
 10.1103/PhysRevB.84.041104
 arXiv:
 arXiv:1003.2233
 Bibcode:
 2011PhRvB..84d1104A
 Keywords:

 71.18.+y;
 71.20.Nr;
 79.60.i;
 Fermi surface: calculations and measurements;
 effective mass g factor;
 Semiconductor compounds;
 Photoemission and photoelectron spectra;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 5 pages, 4 figures