Observation of Magnetization dynamics and Interaction-induced Phases on Topological Insulator Surfaces

Details Observation of Magnetization dynamics and Interaction-induced Phases on Topological Insulator Surfaces Observation of Magnetization dynamics and Interaction-induced Phases on Topological Insulator Surfaces

2010-09-30

arxiv.org/abs/1009.6216v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 Figures, 15 pages, Submitted in December 2009

Scientific paper

Topological insulators embody a newly discovered state of matter characterized by conducting spin-momentum locked surface states that span the bulk band gap. So far, most of the study on topological insulator surfaces has been limited to understanding their properties without strong Coulomb perturbation or breaking of time reversal symmetry. Here we present the first systematic study of the topological insulator surfaces under strong Coulomb, magnetic and disorder perturbations. Understanding the response of a topological surface to perturbations on that scale represents a new frontier in uncovering the critical and emergent behaviors of topological surfaces. We have used deposited iron, with a large positive ionization state and significant magnetic moment as a strong probe to modify the surface electronic structure of the Bi2Se3 surface at the gap energy scale. We observe that such perturbation leads to the creation of multiple Dirac fermions consistent with Z2 or Mod(2) symmetry, and that magnetic interactions break time reversal symmetry, allowing the reduction of ungapped surface bands to an even number of species. We present a theoretical model to account for the observed properties of the altered topological Z2 surface. Taken collectively, these results are a critical guide in manipulating topological surfaces for probing fundamental physics or developing device applications. This work builds up on an earlier (2008) work by us reported at arXiv:0812.2078.

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