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Title: Multiple topological states in iron-based superconductors

Journal Article · · Nature Physics
ORCiD logo [1]; ORCiD logo [2];  [3];  [1];  [1];  [1];  [4];  [5];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [4];  [4];  [6];  [3]; ORCiD logo [7];  [7];  [7] more »; ORCiD logo [7]; ORCiD logo [6]; ORCiD logo [8];  [9];  [10];  [10]; ORCiD logo [1] « less
  1. Univ. of Tokyo, Kashiwa (Japan)
  2. Princeton Univ., Princeton, NJ (United States)
  3. Julius-Maximilians-Univ. Wurzburg, Wurzburg (Germany)
  4. Chinese Academy of Sciences (CAS), Beijing (China)
  5. Univ. of Tokyo, Kashiwa (Japan); Univ. of Tokyo, Tokyo (Japan)
  6. Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  7. Hiroshima Univ., Higashi-Hiroshima (Japan)
  8. Brookhaven National Lab. (BNL), Upton, NY (United States)
  9. Univ. of Tokyo, Tokyo (Japan)
  10. Kyoto Univ., Kyoto (Japan)

Topological materials and unconventional iron-based superconductors are both important areas of study but, to date, relatively little overlap has been identified between these two fields. However, the combination of topological bands and superconductivity promises the manifestation of exotic superconducting states, including Majorana fermions, the central component of topological quantum computation. Here, using laser-based, spin-resolved and angle-resolved photoemission spectroscopy and density functional theory calculations, we have identified both topological insulator and Dirac semimetal states near the Fermi energy in different iron-based superconducting compounds. Carrier doping can tune these topologically non-trivial bands to the Fermi energy, potentially allowing access to several different superconducting topological states in the same material. Furthermore, these results reveal the generic coexistence of superconductivity and multiple topological states in iron-based superconductors, indicating that this broad class of materials is a promising platform for high-temperature topological superconductivity.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1494043
Report Number(s):
BNL-211249-2019-JAAM
Journal Information:
Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 15; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English

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Strong pinning in the hole-doped pnictide superconductor La 0.34 Na 0.66 Fe 2 As 2 journal March 2019
Quantum Anomalous Vortex and Majorana Zero Mode in Iron-Based Superconductor Fe(Te,Se) journal February 2019
Majorana gets an iron twist journal November 2018
Topological transitions in a model for proximity-induced superconductivity journal December 2019
Strong pinning in the hole-doped pnictide superconductor La$_{0.34}$Na$_{0.66}$Fe$_2$As$_2$ text January 2019
Topological quantum states of matter in iron-based superconductors: from concept to material realization journal November 2018
A general route to form topologically-protected surface and bulk Dirac fermions along high-symmetry lines journal March 2019
Higher-Order Topology and Nodal Topological Superconductivity in Fe(Se,Te) Heterostructures journal October 2019
A general route to form topologically-protected surface and bulk Dirac fermions along high-symmetry lines text January 2019
Nonhelical spin texture in the normal states of the centrosymmetric superconductor β − PdBi 2 journal October 2019
Topological quantum states of matter in iron-based superconductors: From concepts to material realization text January 2018
Effect of Sintering Temperature on the Superconductivity of Bi2Se3/FeSe0.5Te0.5Composites journal January 2020
Helical Hinge Majorana Modes in Iron-Based Superconductors journal May 2019
Review of annealing effects and superconductivity in Fe 1+ y Te 1− x Se x superconductors journal August 2019
Quantum Phase Transition of Correlated Iron-Based Superconductivity in LiFe 1 − x Co x As journal November 2019
Higher Order Topology and Nodal Topological Superconductivity in Fe(Se,Te) Heterostructures text January 2019
Weak-pairing higher order topological superconductors journal October 2018
Detection of second-order topological superconductors by Josephson junctions journal January 2020
Weak-Pairing Higher Order Topological Superconductors text January 2018