Common Origin of the Circular-Dichroism Pattern in Angle-Resolved Photoemission Spectroscopy of SrTiO3 and CuxBi2Se3

Y. Ishida, H. Kanto, A. Kikkawa, Y. Taguchi, Y. Ito, Y. Ota, K. Okazaki, W. Malaeb, M. Mulazzi, M. Okawa, S. Watanabe, C.-T. Chen, M. Kim, C. Bell, Y. Kozuka, H. Y. Hwang, Y. Tokura, and S. Shin
Phys. Rev. Lett. 107, 077601 – Published 9 August 2011
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Abstract

Circular dichroism in the angular distribution of photoelectrons from SrTiO3:Nb and CuxBi2Se3 is investigated by 7-eV laser angle-resolved photoemission spectroscopy. In addition to the well-known node that occurs in the circular dichroism pattern when the incidence plane matches the mirror plane of the crystal, we show that another type of node occurs when the mirror plane of the crystal is vertical to the incidence plane and the electronic state is two-dimensional. The flower-shaped circular dichroism patterns in the angular distribution occurring around the Fermi level of SrTiO3:Nb and around the Dirac point of CuxBi2Se3 are explained on equal footings. We point out that the penetration depth of the topological states of CuxBi2Se3 depends on momentum.

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  • Received 2 May 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.077601

© 2011 American Physical Society

Authors & Affiliations

Y. Ishida1, H. Kanto1, A. Kikkawa2, Y. Taguchi2,3, Y. Ito1, Y. Ota1, K. Okazaki1, W. Malaeb1, M. Mulazzi1,*, M. Okawa1, S. Watanabe1, C.-T. Chen4, M. Kim5, C. Bell5,6, Y. Kozuka5, H. Y. Hwang2,5,6, Y. Tokura2,3,7, and S. Shin1,8

  • 1ISSP, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 2Correlated Electron Research Group (CERG), RIKEN Advanced Science Institute, Wako 351-0198, Japan
  • 3Cross-Correlated Materials Research Group (CMRG), RIKEN Advanced Science Institute, Wako 351-0198, Japan
  • 4Technical Institute of Physics and Chemistry, Chinese Academy of Science, Zhongguancun, Beijing 100080, China
  • 5Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
  • 6Department of Applied Physics and Stanford Institute for Materials and Energy Science, Stanford University, Stanford, California 94305, USA
  • 7Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
  • 8CREST, Japan Science and Technology Agency, Tokyo 102-0075, Japan

  • *Present address: Universität Würzburg, Experimentelle Physik VII and Röntgen Research Center for Complex Materials RCCM, Am Hubland, D-97074 Würzburg, Germany.

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Issue

Vol. 107, Iss. 7 — 12 August 2011

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