Magnetoterahertz Response and Faraday Rotation from Massive Dirac Fermions in the Topological Crystalline Insulator Pb${}_{0.5}$Sn${}_{0.5}$Te

Abstract

Pb${}_{1-x}$Sn${}_x$Te has been shown to be an interesting tunable topological crystalline insulator system. We present a magneto-terahertz spectroscopic study of thin films of Pb${}_{0.5}$Sn${}_{0.5}$Te. The complex Faraday rotation angle and optical conductivity in the circular basis are extracted without any additional assumptions. Our quantitative measures of the THz response allow us to show that the sample studied contains two types of bulk carriers. One is $p$-type and originates in 3D Dirac bands. The other is $n$-type and appears to be from more conventional 3D bands. These two types of carriers display different cyclotron resonance dispersions. Through simulating the cyclotron resonance of hole carriers, we can determine the Fermi energy and Fermi velocity. Furthermore, the scattering rates of $p$-type and $n$-type carriers were found to show opposite field dependences, which can be attributed to their different Landau level broadening behaviors under magnetic field. Our work provides a new way to isolate real topological signatures of bulk states in Dirac and Weyl semimetals.

arXiv comment9 pages, 8 figures

References in corpus (26)

• Electric Field Effect in Atomically Thin Carbon Films
• Weyl and Dirac Semimetals in Three Dimensional Solids
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Topological Crystalline Insulators
• 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
• Topological Crystalline Insulators in the SnTe Material Class
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Topological crystalline insulator states in Pb(1-x)Sn(x)Se
• Three-Dimensional Topological Insulators
• Large tuneable Rashba spin splitting of a two-dimensional electron gas in Bi2Se3
• Observation of Dirac node formation and mass acquisition in a topological crystalline insulator
• Evidence for massive bulk Dirac Fermions in Pb${}_{1-x}$Sn${}_x$Se from Nernst and thermopower experiments
• Fermi surface topology and negative longitudinal magnetoresistance observed in centrosymmetric NbAs2 semimetal
• Negative magnetoresistance due to conductivity fluctuations in films of the topological semimetal Cd3As2
• A pressure-induced topological phase with large Berry curvature in Pb${}_{1-x}$Sn${}_x$Te
• Giant semiclassical magnetoresistance in high mobility TaAs2 semimetal
• Constraints on Jones transmission matrices from time-reversal invariance and discrete spatial symmetries
• High-Resolution Faraday Rotation and Electron-Phonon Coupling in Surface States of the Bulk-Insulating Topological Insulator Cu${}_{0.02}$Bi${}_2$Se${}_3$
• Carrier scattering from dynamical magneto-conductivity in quasi-neutral epitaxial graphene
• Extremely large magnetoresistance in topologically trivial semimetal $\alpha$-WP${}_2$
• Breakdown of compensation and persistence of non-saturating magnetoresistance in WTe2 thin flakes
• Resonance-state-induced superconductivity at high Indium contents in In-doped SnTe
• Electron and hole contributions to normal-state transport in the superconducting system Sn${}_{1-x}$In${}_x$Te
• Multi-carrier transport in ZrTe5 film

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