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How robust the topological properties of Bi2Se3 surface are : A topological insulator surface under strong Coulomb, magnetic and disorder perturbations | L. Andrew Wray
; Su-Yang Xu
; Yuqi Xia
; David Hsieh
; Alexei V. Fedorov
; Hsin Lin
; Arun Bansil
; Yew San Hor
; Robert J. Cava
; M. Zahid Hasan
; | Date: |
17 Mar 2011 | Abstract: | Three dimensional topological insulators embody a newly discovered state of
matter characterized by conducting spin-momentum locked surface states that
span the bulk band gap as demonstrated via spin-resolved ARPES measurements .
This highly unusual surface environment provides a rich ground for the
discovery of novel physical phenomena. Here we present the first controlled
study of the topological insulator surfaces under strong Coulomb, magnetic and
disorder perturbations. We have used interaction of iron, with a large Coulomb
state and significant magnetic moment as a probe to extit{systematically test
the robustness} of the topological surface states of the model topological
insulator Bi$_2$Se$_3$. We observe that strong perturbation leads to the
creation of odd multiples of Dirac fermions and that magnetic interactions
break time reversal symmetry in the presence of band hybridization. We also
present a theoretical model to account for the altered surface of Bi$_2$Se$_3$.
Taken collectively, these results are a critical guide in manipulating
topological surfaces for probing fundamental physics or developing device
applications. Some earlier works reported at arXiv:1009.6216v1 (2010) and
arXiv:0812.2078v1 (2008). Present work published at Nature Physics 7, 32
(2011). | Source: | arXiv, 1103.3411 | Services: | Forum | Review | PDF | Favorites |
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