Journal
PHYSICAL REVIEW B
Volume 91, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.161411
Keywords
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Funding
- National Basic Research Program of China [2012CB927401, 2011CB921902, 2013CB921902, 2011CB922200]
- NSFC [11274228, 11174199, 11227404, 11374206, 11134008]
- Shanghai Committee of Science and Technology, China [12JC1405300, 13QH1401500]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [14PJ1404600]
- Shanghai Institutions of Higher Learning
- Top-Notch Young Talents Program
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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.
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