Publication Date:
2017-12-30
Description:
Author(s): S. Kanayama, K. Nakayama, G. N. Phan, M. Kuno, K. Sugawara, T. Takahashi, and T. Sato In the one-monolayer FeSe film on SrTiO 3 , which is a new member of high-temperature superconductor family, there exists two competing proposals on the nature of the ground state in the parent undoped film: strongly correlated insulator (as in copper-oxide superconductors) versus moderately correlated metal (as in iron-based superconductors). Here, the authors provide experimental evidence for the metallic nature by performing i n s i t u angle-resolved photoemission spectroscopy on an undoped one-monolayer FeSe film prepared by careful post-growth annealing. The authors demonstrate the materialization of an ideal two-dimensional Dirac electron system, where only the Dirac-cone band crosses the Fermi level, unlike in the multilayer counterpart. [Phys. Rev. B 96, 220509(R)] Published Fri Dec 29, 2017
Keywords:
Superfluidity and superconductivity
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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