Observation of Dirac cone band dispersions in FeSe thin films by photoemission spectroscopy

S. Y. Tan, Y. Fang, D. H. Xie, W. Feng, C. H. P. Wen, Q. Song, Q. Y. Chen, W. Zhang, Y. Zhang, L. Z. Luo, B. P. Xie, X. C. Lai, and D. L. Feng
Phys. Rev. B 93, 104513 – Published 9 March 2016

Abstract

The search for novel materials with Dirac cone band dispersion is one of the most challenging and important works for both fundamental physics and technological applications. Here, we studied the electronic structure of FeSe thin films grown on SrTiO3 substrates by angle-resolved photoemission spectroscopy (ARPES). We revealed the existence of Dirac cone band dispersions in FeSe thin films thicker than 1 unit cell below the nematic transition temperature, whose apexes are located −10 meV below Fermi energy. The evolution of electronic structures for FeSe thin films as a function of temperature, thickness, and cobalt doping were systematically studied. The Dirac cones coexist with the nematicity in FeSe and disappear when nematicity is suppressed. Our results provide useful guidelines for understanding the novel electronic structure, nematicity, and superconductivity in the FeSe system.

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  • Received 13 December 2015
  • Revised 24 January 2016

DOI:https://doi.org/10.1103/PhysRevB.93.104513

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Y. Tan1, Y. Fang1, D. H. Xie1, W. Feng1, C. H. P. Wen2, Q. Song2, Q. Y. Chen1,2, W. Zhang1, Y. Zhang1, L. Z. Luo1, B. P. Xie2, X. C. Lai1,*, and D. L. Feng2,†

  • 1Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621908, China
  • 2Physics Department, Applied Surface Physics State Key Laboratory, and Advanced Materials Laboratory, Fudan University, Shanghai 200433, China

  • *laixinchun@caep.cn
  • dlfeng@fudan.edu.cn

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Vol. 93, Iss. 10 — 1 March 2016

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