Momentum-Resolved Kondo Hybridization of Nonsymmorphic Dirac-Derived Bands in CeAgBi${}_2$

Abstract

How symmetry-constrained conduction states acquire heavy-quasiparticle character is a central question in correlated quantum materials. Combining angle-resolved photoemission spectroscopy, Ce $4d\to 4f$ resonant photoemission, and first-principles calculations, we investigate the nonsymmorphic Kondo lattice CeAgBi${}_2$. We identify quasi-two-dimensional Bi-square-net-derived bands consistent with calculated Dirac crossings and nodal lines. Resonant photoemission resolves a nearly dispersionless Ce 4$f$ band near the Fermi level, establishing Kondo heavy-quasiparticle states. Its pronounced momentum-dependent spectral weight at intersections with the identified Dirac-derived branches provides direct spectroscopic evidence for their participation in $c$-$f$ hybridization. Complementary measurements on independently cleaved samples and an effective hybridization model connect these branches to the Kondo heavy-quasiparticle spectrum. The combined results support preservation of nonsymmorphic Dirac-band connectivity under Kondo renormalization, showing how symmetry-constrained conduction states become constituents of correlated heavy quasiparticles.

arXiv comment7 pages, 4 figures