Spin-polarized imaging of strongly interacting fermions in the ferrimagnetic state of Weyl candidate CeBi

Abstract

CeBi has an intricate magnetic phase diagram whose fully-polarized state has recently been suggested as a Weyl semimetal, though the role of $f$ states in promoting strong interactions has remained elusive. Here we focus on the less-studied, but also time-reversal symmetry-breaking ferrimagnetic phase of CeBi, where our density functional theory (DFT) calculations predict additional Weyl nodes near the Fermi level $E_{\mathrm{F}}$. We use spin-polarized scanning tunneling microscopy and spectroscopy to image the surface ferrimagnetic order on the itinerant Bi $p$ states, indicating their orbital hybridization with localized Ce $f$ states. We observe suppression of this spin-polarized signature at $E_{\mathrm{F}}$, coincident with a Fano line shape in the conductance spectra, suggesting the Bi $p$ states partially Kondo screen the $f$ magnetic moments, and this $p-f$ hybridization causes strong Fermi-level band renormalization. The $p$ band flattening is supported by our quasiparticle interference (QPI) measurements, which also show band splitting in agreement with DFT, painting a consistent picture of a strongly interacting magnetic Weyl semimetal.

References in corpus (21)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Negative magnetoresistance without well-defined chirality in the Weyl semimetal TaP
• Correlated quantum phenomena in the strong spin-orbit regime
• Magnetic Weyl Semimetal Phase in a Kagome Crystal
• Topological Kondo Insulators
• Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• Heavy Fermions and Quantum Phase Transitions
• Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet
• Interacting topological insulators: a review
• Imaging the Fano Lattice to 'Hidden Order' Transition in URu2Si2
• Weyl-Kondo Semimetal in Heavy Fermion Systems
• Atomic Scale Visualization of Quantum Interference on a Weyl Semimetal Surface by Scanning Tunneling Microscopy/Spectroscopy
• Fractionalized Topological Insulators
• Possible Weyl fermions in the magnetic Kondo system CeSb
• Experimental determination of the topological phase diagram in Cerium monopnictides
• Imaging emergent heavy Dirac fermions of a topological Kondo insulator
• Magnetic-field-induced nontrivial electronic state in the Kondo-lattice semimetal CeSb
• Large Fermi Surface Expansion through Anisotropic c-f Mixing in the Semimetallic Kondo Lattice System CeBi
• Prediction of Spin Polarized Fermi Arcs in Quasiparticle Interference of CeBi

Cited by in corpus (2)

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