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Surface Scattering via Bulk Continuum States in the 3D Topological Insulator Bi₂Se₃

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arxiv 1106.2681 v3 pith:BX7KBVS7 submitted 2011-06-14 cond-mat.mes-hall

Surface Scattering via Bulk Continuum States in the 3D Topological Insulator Bi$_{2}$Se$_{3}$

classification cond-mat.mes-hall
keywords bulksurfacestatescontinuumdiracelectroninsulatorinterference
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

We have performed scanning tunneling microscopy and differential tunneling conductance ($dI/dV$) mapping for the surface of the three dimensional topological insulator Bi$_{2}$Se$_{3}$. The fast Fourier transformation applied to the $dI/dV$ image shows an electron interference pattern near Dirac node despite the general belief that the backscattering is well suppressed in the bulk energy gap region. The comparison of the present experimental result with theoretical surface and bulk band structures shows that the electron interference occurs through the scattering between the surface states near the Dirac node and the bulk continuum states.

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