Surface states in lightly hole-doped sodium cobaltate Na1-y CoO2

Meng Yu Yao, Lin Miao, N. L. Wang, J. H. Dil, M. Z. Hasan, D. D. Guan, C. L. Gao, Canhua Liu, Dong Qian, Jin Feng Jia

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Abstract

Using high-resolution angle-resolved photoemission spectroscopy (ARPES), surface states that were proposed to be useful for constructing the topological superconducting state in sodium cobaltates are experimentally explored. Two energy bands are observed to cross the Fermi level in the large x region. Through in situ surface electron doping, temperature-dependent ARPES measurements, and spin-resolved ARPES measurements, we demonstrate the existence of surface states due to less Na on the surface than in the bulk, as predicted in theory.

Original languageEnglish (US)
Article number161411
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number16
DOIs
StatePublished - Apr 24 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Yao, M. Y., Miao, L., Wang, N. L., Dil, J. H., Hasan, M. Z., Guan, D. D., Gao, C. L., Liu, C., Qian, D., & Jia, J. F. (2015). Surface states in lightly hole-doped sodium cobaltate Na1-y CoO2. Physical Review B - Condensed Matter and Materials Physics, 91(16), [161411]. https://doi.org/10.1103/PhysRevB.91.161411