Emergence of Fermi arcs and novel magnetic splitting in an antiferromagnet

Abstract

The Fermi arcs are signatures of exotic states in solids because they defy conventional concept of Fermi surfaces as closed contours in momentum space. Fermi arcs were first discovered in cuprates, and caused by the pseudogap. Weyl semimetals provided another way to generate Fermi arcs by breaking either the time reversal symmetry (TRS) or inversion symmetry of a 3D Dirac semimetal, which can result in a Weyl semimetal with pairs of Weyl nodes that have opposite chirality. The bulk-boundary correspondence associated with the Chern number leads to the emergence of Fermi arcs on the boundary. Here, we present experimental evidence that pairs of magnetically split hole- and electron-like Fermi arcs emerge below the Neel temperature, in the antiferromagnetic (AFM) state of cubic NdBi due to a novel band splitting effect. Whereas TRS is broken by the AFM order, both inversion and nonsymmorphic TRS are preserved in the bulk, precluding the possibility of a Weyl semimetal. The observed magnetic splitting is highly unusual, as it creates bands of opposing curvature, that changes with temperature and follows the antiferromagnetic order parameter. This is completely different from previously reported cases of magnetic splittings such as traditional Zeeman and Rashba, where the curvature of the bands is preserved. Therefore, our finding represents a new Fermionic state created by new type of magnetic band splitting in the presence of a long-range AFM order that are not readily explained by existing theoretical ideas.

16 pages, 4 figures main text and 20 pages, 12 figures supplement

References in corpus (7)

• Antiferromagnetism in RuO${}_2$ as $d$-wave Pomeranchuk instability
• Topological semimetals and topological insulators in rare earth monopnictides
• Surface floating 2D bands in layered nonsymmorphic semimetals: ZrSiS and related compounds
• Observation of a cubic Rashba effect in the surface spin structure of rare-earth ternary materials
• Devil's staircase transition of the electronic structures in CeSb
• Unusual change in the Dirac-cone energy band upon two-step magnetic transition in CeBi
• Prediction of Spin Polarized Fermi Arcs in Quasiparticle Interference of CeBi

Cited by in corpus (29)

• Observation of plaid-like spin splitting in a noncoplanar antiferromagnet
• Intrinsic Magnetic Topological Materials
• Rare-earth monopnoctides -- family of antiferromagnets hosting magnetic Fermi arcs
• Complex electronic structure evolution of NdSb across the magnetic transition
• Directional effects of antiferromagnetic ordering on the electronic structure in NdSb
• Fermi and Luttinger arcs: two concepts, realized on one surface
• Antiferromagnetic topological insulator with selectively gapped Dirac cones
• Unusual surface states associated with the PT-symmetry breaking and antiferromagnetic band folding in NdSb
• Epitaxial growth, magnetoresistance, and electronic band structure of GdSb magnetic semimetal films
• Projected spin texture as a bulk indicator of fragile topology
• Origin of the exotic electronic states in antiferromagnetic NdSb
• Helicity-dependent Ultrafast Photocurrents in Weyl Magnet Mn${}_3$Sn
• Unconventional Surface State Pairs in a High-Symmetry Lattice with Anti-ferromagnetic Band-folding
• Unexpected changes in the band structure within AFM1 state of CeBi
• Observation of spin splitting in the surface electronic structure of antiferromagnet NdBi
• Temperature-dependent Fermi surface probed by Shubnikov-de Haas oscillations in topological semimetal candidates DyBi and HoBi
• Tunable non-Lifshitz-Kosevich temperature dependence of Shubnikov-de Haas oscillation amplitudes in SmSb
• Complex Fermiology and Electronic Structure of Antiferromagnet EuSnP
• Long-range magnetic order induced surface state in GdBi and DyBi
• Non-trivial topology in rare-earth monopnictides from dimensionality reduction
• Non-Hermitian Boundary in a Surface Selective Reconstructed Magnetic Weyl Semimetal
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Tailoring Neel orders in Layered Topological Antiferromagnets
• Electronic signatures of successive itinerant, magnetic transitions in hexagonal La2Ni7
• Universal Role of Combined Symmetry for the Protection of the Dirac Cone in Antiferromagnetic Topological Insulators
• Observation of unexpected band splitting and magnetically-induced band structure reconstruction in TbTi${}_3$Bi${}_4$
• Unconventional band splitting of CeSb in the devil's staircase transition
• Cubic Dirac Semimetals: General Theory and Application to Rare-Earth Magnets
• Scanning Tunneling Microscopy in high vectorial magnetic fields