Massive Dirac Fermion on the Surface of a Magnetically Doped Topological Insulator

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Topological insulators are characterized by a massless Dirac surface state and a bulk energy gap. An insulating massive Dirac fermion state is predicted to occur if the breaking of the time reversal symmetry opens an energy gap at the Dirac point, provided that the Fermi-energy resides inside both the surface and bulk gaps. By introducing magnetic dopants into the three dimensional topological insulator Bi{sub 2}Se{sub 3} to break the time reversal symmetry, we observed the formation of a massive Dirac fermion on the surface; simultaneous magnetic and charge doping furthermore positioned the Fermi-energy inside the Dirac gap. The insulating massive ... continued below

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Chen, Y. L.; Chu, J.-H.; Analytis, J. G.; Liu, Z. K.; Igarashi, K.; Kuo, H.-H. et al. May 20, 2011.

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Topological insulators are characterized by a massless Dirac surface state and a bulk energy gap. An insulating massive Dirac fermion state is predicted to occur if the breaking of the time reversal symmetry opens an energy gap at the Dirac point, provided that the Fermi-energy resides inside both the surface and bulk gaps. By introducing magnetic dopants into the three dimensional topological insulator Bi{sub 2}Se{sub 3} to break the time reversal symmetry, we observed the formation of a massive Dirac fermion on the surface; simultaneous magnetic and charge doping furthermore positioned the Fermi-energy inside the Dirac gap. The insulating massive Dirac Fermion state thus obtained may provide a tool for studying a range of topological phenomena relevant to both condensed matter and particle physics.

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  • Journal Name: Science 329:659,2010

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  • Report No.: SLAC-PUB-14357
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1014122
  • Archival Resource Key: ark:/67531/metadc845283

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  • May 20, 2011

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  • May 19, 2016, 3:16 p.m.

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  • June 3, 2016, 6:17 p.m.

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Chen, Y. L.; Chu, J.-H.; Analytis, J. G.; Liu, Z. K.; Igarashi, K.; Kuo, H.-H. et al. Massive Dirac Fermion on the Surface of a Magnetically Doped Topological Insulator, article, May 20, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc845283/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.