Temperature-driven band inversion in Pb${}_{0.77}$Sn${}_{0.23}$Se: Optical and Hall-effect studies

Abstract

Optical and Hall-effect measurements have been performed on single crystals of Pb${}_{0.77}$Sn${}_{0.23}$Se, a IV-VI mixed chalcogenide. The temperature dependent (10--300 K) reflectance was measured over 40--7000 cm${}^{-1}$ (5--870 meV) with an extension to 15,500 cm${}^{-1}$ (1.92 eV) at room temperature. The reflectance was fit to the Drude-Lorentz model using a single Drude component and several Lorentz oscillators. The optical properties at the measured temperatures were estimated via Kramers-Kronig analysis as well as by the Drude-Lorentz fit. The carriers were p-type with the carrier density determined by Hall measurements. A signature of valence intraband transition is found in the low-energy optical spectra. It is found that the valence-conduction band transition energy as well as the free carrier effective mass reach minimum values at 100 K, suggesting temperature-driven band inversion in the material. Density function theory calculation for the electronic band structure also make similar predictions.

arXiv comment10 pages, 15 figures

References in corpus (7)

• Topological Crystalline Insulators
• Topological Crystalline Insulators in the SnTe Material Class
• Topological crystalline insulator states in Pb(1-x)Sn(x)Se
• Band structure of SnTe studied by Photoemission Spectroscopy
• Spin-polarized (001) surface states of the topological crystalline insulator Pb_{0.73}Sn_{0.27}Se
• Bulk Signatures of Pressure-Induced Band Inversion and Topological Phase Transitions in Pb${}_{1-x}$Sn${}_x$Se
• Optical investigation of thermoelectric topological crystalline insulator Pb${}_{0.77}$Sn${}_{0.23}$Se

Cited by in corpus (6)

• Use of X-ray scattering functions in Kramers-Kronig analysis of reflectance
• Unraveling the Topological Phase of ZrTe${}_5$ via Magneto-infrared Spectroscopy
• Observation of Ultrahigh Mobility Surface States in a Topological Crystalline Insulator by Infrared Spectroscopy
• Optical investigation of thermoelectric topological crystalline insulator Pb${}_{0.77}$Sn${}_{0.23}$Se
• Landau level spectroscopy of PbSnSe topological crystalline insulator
• Nernst-Ettingshausen effect at the trivial-nontrivial band ordering in topological crystalline insulator Pb1-xSnxSe