Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd${}_2$As${}_2$

Abstract

Weyl fermions as emergent quasiparticles can arise in Weyl semimetals (WSMs) in which the energy bands are nondegenerate, resulting from inversion or time-reversal symmetry breaking. Nevertheless, experimental evidence for magnetically induced WSMs is scarce. Here, using photoemission spectroscopy, we observe that the degeneracy of Bloch bands is already lifted in the paramagnetic phase of EuCd${}_2$As${}_2$. We attribute this effect to the itinerant electrons experiencing quasistatic and quasi-long-range ferromagnetic fluctuations. Moreover, the spin nondegenerate band structure harbors a pair of ideal Weyl nodes near the Fermi level. Hence, we show that long-range magnetic order and the spontaneous breaking of time-reversal symmetry are not an essential requirement for WSM states in centrosymmetric systems, and that WSM states can emerge in a wider range of condensed-matter systems than previously thought.

arXiv comment34 pages,12 figures

References in corpus (26)

• Anomalous Hall effect
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Maximally localized Wannier functions: Theory and applications
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Type-II Weyl Semimetals
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
• Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
• Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs
• Chern semi-metal and Quantized Anomalous Hall Effect in HgCr2Se4
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• Observation of Weyl nodes in TaAs
• Large anomalous Hall effect driven by non-vanishing Berry curvature in non-collinear antiferromagnetic Mn3Ge
• Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• The chiral anomaly and thermopower of Weyl fermions in the half-Heusler GdPtBi
• Spectroscopic evidence for type II Weyl semimetal state in MoTe2
• Observation of Time-Reversal Symmetry Breaking in the Non-Centrosymmetric Superconductor Re6Zr
• Dirac semimetal in type IV magnetic space group
• Coupling of magnetic order and charge transport in the candidate Dirac semimetal EuCd${}_2$As${}_2$
• Nodeless superconductivity and time-reversal symmetry breaking in the noncentrosymmetric superconductor Re24Ti5
• Weyl Fermions in antiferromagnetic Mn(3)Sn and Mn(3)Ge
• Electron and hole doping in the relativistic Mott insulator Sr${}_2$IrO${}_4$: a first-principles study using band unfolding technique
• Ru-doping on iron based pnictides: the "unfolded" dominant role of structural effects for superconductivity

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