Optical study of three-dimensional Weyl semimetal Mn${}_3$Sn

Abstract

Three-dimensional (3D) Weyl semimetal Mn${}_3$Sn has attracted tremendous attention due to its great application potential. However, the complex magnetic structures at different temperature intervals make it extremely difficult to unravel the underlying electronic structures of Mn${}_3$Sn. Here, we perform temperature-dependent optical spectroscopy measurements on single crystalline Mn${}_3$Sn to investigate its charge dynamics. We find that both of the optical reflectivity $R(\omega )$ and conductivity ${\sigma }_1(\omega )$ evolve very smoothly across the magnetic phase transition at $T_M$ = 285 K, where the giant anomalous Hall effect (AHE) at room temperature drops significantly. Furthermore, two linearly increasing segments of ${\sigma }_1(\omega )$ are observed in the whole temperature range from 300 K to 10 K, indicating that the existence of Weyl fermions is very robust against the magnetic phase transition. In addition, the Weyl points closest to the Fermi level $E_F$ are identified to be located about 101 meV away from $E_F$ at 10 K, and the associated Fermi velocity is about 2.55 $\times 10^7$ cm/s. Our results reveal that the phase transition at $T_M$ only generates subtle modification to the band structure, which helps to further uncover the mechanism of the dramatic change of AHE in Mn${}_3$Sn.

References in corpus (29)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Search for Majorana fermions in superconductors
• Topological Materials: Weyl Semimetals
• Large anomalous Nernst effect at room temperature in a chiral antiferromagnet
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• Charge Transport in Weyl Semimetals
• Large magneto-optical Kerr effect and imaging of magnetic octupole domains in an antiferromagnetic metal
• Topological Weyl semimetals in the chiral antiferromagnetic materials Mn3Ge and Mn3Sn
• Topological Semimetals Predicted from First-principles Calculations
• Chiral anomaly and transport in Weyl metals
• Anomalous Nernst and Righi-Leduc effects in Mn${}_3$Sn: Berry curvature and entropy flow
• Optical spectroscopy study of three dimensional Dirac semimetal ZrTe${}_5$
• Chiral anomaly and optical absorption in Weyl semimetals
• Optical Signatures of Weyl Points in TaAs
• Nernst and magneto-thermal conductivity in a lattice model of Weyl fermions
• Use of X-ray scattering functions in Kramers-Kronig analysis of reflectance
• Field induced topological Hall effect in non-coplanar triangular antiferromagnetic geometry of Mn3Sn
• Magnetic Phase Dependence of the Anomalous Hall Effect in Mn${}_3$Sn Single Crystals
• Optical Signatures of Dirac Nodal-lines in NbAs${}_2$
• Low frequency optical conductivity in graphene and in other scale-invariant two-band systems
• Magnetic Excitations in Non-Collinear Antiferromagnetic Weyl Semimetal $\mathsf{M}{\mathsf{n}}_3\mathsf{Sn}$
• Field-linear anomalous Hall effect and Berry curvature induced by spin chirality in the kagome antiferromagnet Mn3Sn
• Anomalous thermoelectric phenomena in lattice models of multi-Weyl semimetals
• Terahertz conductivity of the magnetic Weyl semimetal Mn${}_3$Sn films
• Momentum-space and real-space Berry curvatures in Mn${}_3$Sn

Cited by in corpus (2)

• Hydrostatic and chemical pressure driven crossover from commensurate to the incommensurate state of the Weyl semimetal Mn${}_{3+x}$Sn${}_{1-x}$
• Localized surface plasmons in a Weyl semimetal nanosphere