Quasiparticle interference on the surface of 3D topological insulator Bi₂Se₃ induced by cobalt adatom in the absence of ferromagnetic ordering

2011/12/14 by M. Ye, S. V. Eremeev, Ye, M. +33
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #cond-mat.mes-hall #cond-mat.mtrl-sci

paper · pdf · doi:10.48550/arxiv.1112.3206

5 pages, 6 figures

arxiv created 2011/12/15 · arxiv updated 2011/12/16

Abstract

Quasiparticle interference induced by cobalt adatoms on the surface of the topological insulator Bi₂Se₃ is studied by scanning tunneling microscopy, angle-resolved photoemission spectroscopy and X-ray magnetic circular dichroism. It is found that Co atoms are selectively adsorbed on top of Se sites and act as strong scatterers at the surface, generating anisotropic standing waves. A long-range magnetic order is found to be absent, and the surface state Dirac cone remains gapless. The anisotropy of the standing wave is ascribed to the heavily warped iso-energy contour of unoccupied states, where the scattering is allowed due to a non-zero out-of-plane spin.

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