Systematic study of Mn-doping trends in optical properties of (Ga,Mn)As
T. Jungwirth, P. Horodyska, N. Tesarova, P. Nemec, J. Subrt, P. Maly, P. Kuzel, C. Kadlec, J. Masek, I. Nemec, V. Novak, K. Olejnik, Z. Soban, P. Vasek, P. Svoboda, Jairo Sinova
We report on a systematic study of optical properties of (Ga,Mn)As epilayers spanning the wide range of accessible substitutional Mn_Ga dopings. The growth and post-growth annealing procedures were optimized for each nominal Mn doping in order to obtain films which are as close as possible to uniform uncompensated (Ga,Mn)As mixed crystals. We observe a broad maximum in the mid-infrared absorption spectra whose position exhibits a prevailing blue-shift for increasing Mn-doping. In the visible range, a peak in the magnetic circular dichroism blue shifts with increasing Mn-doping. These observed trends confirm that disorder-broadened valence band states provide a better one-particle representation for the electronic structure of high-doped (Ga,Mn)As with metallic conduction than an energy spectrum assuming the Fermi level pinned in a narrow impurity band.
A Systematic Study to Improve the Performance of SrCoO3 as anAnion-Intercalation-Type Electrode for Supercapacitors Through Interface, Oxygen Vacancies, and Doping
Selenium direct doping obtained high-performance-n-type Bi2Te3-based thermoelectric materials with a wide temperature range
Advanced Ceramics Research Center, School of Materials Science and Engineering, Anhui University of Technology（安徽工业大学材料科学与工程学院先进陶瓷研究中心）；Institute of Energy, Hefei Comprehensive National Science Center (Anhui Energy Laboratory)（合肥综合性国家科学中心能源研究院（安徽能源实验室））；School of Chemistry and Materials Science, University of Science and Technology of China（中国科学技术大学化学与材料科学学院）
通过高温熔炼结合退火工艺制备 n 型 Bi2Te3 基热电材料，研究硒掺杂量和退火对载流子浓度、双极效应抑制及热电性能的影响，为相关研究提供参考。
