Linear-in-Frequency Optical Conductivity over a broad range in the three-dimensional Dirac semimetal candidate Ir${}_2$In${}_8$Se

Abstract

The optical conductivity of the new Dirac semimetal candidate Ir${}_2$In${}_8$Se is measured in a frequency range from 40 to 30000 cm${}^{-1}$ at temperatures from 300 K down to 10 K. The measurement reveals that the compound is a low carrier density metal. We find that the real part of the conductivity ${\sigma }_1(\omega )$ is linear in frequency over a broad range from 500 to 4000 cm${}^{-1}$ at 300 K and varies slightly with cooling. This linearity strongly suggests the presence of three-dimensional linear electronic bands with band crossings near the Fermi level. Band structure calculations indicate the presence of type-II Dirac points. By comparing our data with the optical conductivity computed from the band structure, we conclude that the observed linear dependence mainly originates from the Dirac cones and the transition between the Dirac cones and the next lower bands. In addition, a weak energy gap feature is resolved below the charge density wave phase transition temperature in reflectivity spectra. An enhanced structure arising from the imperfect Fermi surface nesting is identified in the electronic susceptibility function, suggesting a Fermi surface nesting driven instability.

References in corpus (43)

• Maximally-localized generalized Wannier functions for composite energy bands
• Maximally localized Wannier functions: Theory and applications
• WannierTools: An open-source software package for novel topological materials
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Maximally-localized Wannier functions for entangled energy bands
• The Chiral Magnetic Effect
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
• Experimental Realization of a Three-Dimensional Dirac Semimetal
• Fermi surface nesting and the origin of Charge Density Waves in metals
• Large intrinsic anomalous Hall effect in half-metallic ferromagnet Co3Sn2S2 with magnetic Weyl fermions
• Quantum transport evidence for a three-dimensional Dirac semimetal phase in Cd3As2
• Charge Transport in Weyl Semimetals
• Negative Magnetoresistance in Dirac Semimetal Cd3As2
• Irvsp: to obtain irreducible representations of electronic states in the VASP
• Double crystallographic groups and their representations on the Bilbao Crystallographic Server
• Chiral Anomaly and Diffusive Magnetotransport in Weyl Metals
• Optical spectroscopy study of three dimensional Dirac semimetal ZrTe${}_5$
• Three-dimensional Dirac fermions in quasicrystals as seen via optical conductivity
• Chiral anomaly and optical absorption in Weyl semimetals
• Optical Signatures of Weyl Points in TaAs
• Landau level splitting in Cd3As2 under high magnetic fields
• Use of X-ray scattering functions in Kramers-Kronig analysis of reflectance
• Anisotropic Fermi Surface and Quantum Limit Transport in High Mobility 3D Dirac Semimetal Cd3As2
• Interband optical conductivity of the [001]-oriented Dirac semimetal Cd3As2
• Nature of charge density waves and superconductivity in 1\emph{T}-TaSe${}_{2-x}$Te${}_x$
• Disorder suppressed charge-density-wave and its origin in 1T-TaSe2-xTex
• Light-Driven Raman Coherence as a Non-Thermal Route to Ultrafast Topology Switching
• Tunable circular dichroism due to the chiral anomaly in Weyl semimetals
• Coexistence and competition of multiple charge-density-wave orders in rare-earth tri-telluride RTe3
• Low frequency optical conductivity in graphene and in other scale-invariant two-band systems
• Pressure-driven Superconductivity in Transition-metal Pentatelluride HfTe5
• Optical signatures of multifold fermions in the chiral topological semimetal CoSi
• 3D Dirac cone carrier dynamics in Na3Bi and Cd3As2
• Strain-induced quantum topological phase transitions in Na3Bi
• Optical signature of Weyl electronic structures in tantalum pnictides Ta$Pn$ ($Pn=$ P, As)
• Revealing extremely low energy amplitude modes in the charge-density-wave compound LaAgSb${}_2$
• Widely Tunable Optical and Thermal Properties of Dirac Semimetal Cd${}_3$As${}_2$
• Linear-in-frequency optical conductivity in GdPtBi due to transitions near the triple points
• Non-uniform carrier density in Cd${}_3$As${}_2$ evidenced by optical spectroscopy
• Optical spectroscopy and ultrafast pump-probe study of a quasi-one-dimensional charge density wave in CuTe
• Pressure-induced reconstructive phase transition in Cd${}_3$As${}_2$

Cited by in corpus (1)

• The role of torsion in holographic conductivity