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Gap-filling states induced by disorder and Zeeman coupling in the nodeless chiral superconducting Bi/Ni bilayer system

Ghadimi, R ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevB.100.024502
  3. Publisher: American Physical Society , 2019
  4. Abstract:
  5. Motivated by the recently discovered time-reversal symmetry-breaking superconductivity in the epitaxial Bi/Ni bilayer system with transition temperature Tc≈4.2K and the observation of a zero-bias anomaly in a background of gap-filling states in tunneling measurements, we show that gap-filling states can appear in the fully gapped dxy±idx2-y2 superconducting states. We consider a model of helical electron states with d-wave pairing. In particular, we show that both magnetic and nonmagnetic impurities can create states within the superconducting gap. Alternatively, we show that the coupling of the electron spins to the in-plane Zeeman field provided by nickel can also create gap-filling states by producing Bogoliubov Fermi surfaces. © 2019 American Physical Society
  6. Keywords:
  7. Bilayer systems ; Non-magnetic impurities ; Superconducting gaps ; Superconducting state ; Time-reversal-symmetry breaking superconductivity ; Tunneling measurement ; Zeeman coupling ; Zero-bias anomaly ; Filling
  8. Source: Physical Review B ; Volume 100, Issue 2 , 2019 ; 24699950 (ISSN)
  9. URL: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.100.024502