Band gap anomaly and topological properties in lead chalcogenides
نویسندگان
چکیده
منابع مشابه
Band-gap tuning and linear magnetoresistance in the silver chalcogenides.
Optimally doped silver selenide and silver telluride exhibit linear positive magnetoresistance over decades in magnetic field and on a scale comparable to the colossal magnetoresistance compounds. We use hydrostatic pressure to smoothly alter the band structure of Ag-rich and Ag-deficient samples of semiconducting Ag(2 +/-delta)Te of fixed stoichiometry and disorder. We find that the magnetores...
متن کاملMicro- and Macromechanical Properties of Thermoelectric Lead Chalcogenides.
Both n- and p-type lead telluride (PbTe)-based thermoelectric (TE) materials display high TE efficiency, but the low fracture strength may limit their commercial applications. To find ways to improve these macroscopic mechanical properties, we report here the ideal strength and deformation mechanism of PbTe using density functional theory calculations. This provides structure-property relations...
متن کاملBand Structure and Scattering Mechanisms in Lead Chalcogenides from Transport Phenomena
The non-parabolicity, temperature dependence of an effective mass and scattering mechanisms in PbTe, PbSe, PbS are considered. The methods of investigation of non-parabolicity based upon measurement of thermoelectric power in strong magnetic fields and Nernst-Ettingshausen coefficient (together with other kinetic coefficients) are discussed. The results given by these methods are shown and disc...
متن کاملQuasiparticle band gap in the topological insulator Bi2Te3
I. A. Nechaev1,2 and E. V. Chulkov1,2,3,4 1Donostia International Physics Center (DIPC), 20018 San Sebastián/Donostia, Basque Country, Spain 2Tomsk State University, 634050 Tomsk, Russia 3Departamento de Fı́sica de Materiales UPV/EHU, Facultad de Ciencias Quı́micas, UPV/EHU, Apdo. 1072, 20080 San Sebastián/Donostia, Basque Country, Spain 4Centro de Fı́sica de Materiales CFM MPC, Centro Mixto CSIC-...
متن کاملFull-Potential Optical Calculations of Lead Chalcogenides
We report on ab initio calculations of the optical properties of the lead chalcogenides PbS, PbSe, and PbTe performed with a relativistic full-potential linear muffin-tin orbital method within the local density approximation. Our calculated spectra are in excellent agreement with recent ellipsometry measurements. The origin of the peaks in the spectra is discussed, as well as the effects of inc...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Chinese Physics B
سال: 2016
ISSN: 1674-1056
DOI: 10.1088/1674-1056/25/3/037311