Topography of new Fermi arcs revealed

images of fermi arcs from the highlight research.
Fermi arc at the surface of t-PtBi2 (upper plot) with well defined end points. Band that forms the arc (lower plot) shown along diagonal direction indicated above by dotted line.

Scientific Achievement

The topography of Fermi arcs in trigonal PtBi2 (ti-PtBi2) was revealed. Unlike in other topological materials, the arc in t-PtBi2 is well separated from other bands, which allows precise determination of its end-points, dispersion, and Fermi crossing of the band that forms it. 

Significance and Impact

Detailed information about topography of these arcs is important for comparison with theory and to interpret results of transport and photoelectric experiments.

Research Details

  • High resolution angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT)  revealed the topography of newly discovered Fermi arcs
  • Detailed measurements at precisely identified Fermi crossing revealed an absence of a superconducting gap, in contradiction to previous studies.

Evan O’Leary, Zhuoqi Li, Lin-Lin Wang, Benjamin Schrunk, Andrew Eaton, Paul C. Canfield and Adam Kaminski, Topography of Fermi Arcs in t-PtBi2 Using High Resolution Angle-resolved Photoemission Spectroscopy,  Phys. Rev. B Editor’s Suggestion, 112, 085154 (2025). https://doi.org/10.1103/n5pz-j2sl