Spin-Polarized Quantum Well States on Bi${}_{2-x}$Fe${}_x$Se${}_3$

Abstract

Low temperature scanning tunneling microscopy is used to image the doped topological insulator Bi${}_{2-x}$Fe${}_x$Se${}_3$. Interstitial Fe defects allow the detection of quasiparticle interference (QPI), and the reconstruction of the empty state band structure. Quantitative comparison between measured data and density functional theory calculations reveals the unexpected coexistence of quantum well states (QWS) with topological surface states (TSS) on the atomically clean surface of Bi${}_{2-x}$Fe${}_x$Se${}_3$. Spectroscopic measurements quantify the breakdown of linear dispersion due to hexagonal warping. Nonetheless, both QWS and TSS remain spin-polarized and protected from backscattering to almost 1 eV above the Dirac point, suggesting their utility for spin-based applications.

5 pages, 4 figures

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• An ultra-high vacuum scanning tunneling microscope operating at sub-Kelvin temperatures and high magnetic fields for spin-resolved measurements
• Double Fe-impurity charge state in the topological insulator Bi${}_2$Se${}_3$
• Scattering properties of the three-dimensional topological insulator Sb2Te3: Coexistence of topologically trivial and non-trivial surface states with opposite spin-momentum helicity
• Enhanced, homogeneous type II superconductivity in Cu-intercalated PdTe${}_2$