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A. Lusson,N. Haneche,V. Sallet,P. Galtier,V. Munoz-Sanjose,J. Zuniga-Perez,S. Agouram,J. A. Bastos Segura,E. Leroy 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
Zn(1-x)CdxO solid solutions with a composition ranging from pure ZnO up to x = 0.07 have been grown on ZnO substrates by using metalorganic chemical vapor deposition (MO-CVD). The alloy concentration was carefully measured using a Castaing electron microprobe. The measured lateral homogeneity of the alloy was around 0.1 %. Two dierent photoluminescence lines were observed on Zn(1-x)CdxO alloys. At low temperature, a localized exciton line was identied and a second line appeared at higher energy for intermediate temperatures. This eect is interpreted as a delocalization eect of excitons trapped in potential uctuations related to a local alloy disorder. Zn(1-x)CdxO solid solutions with a composition ranging from pure ZnO up to x = 0.07 have been grown on ZnO substrates by using metalorganic chemical vapor deposition (MO-CVD). The alloy concentration was carefully measured using a Castaing electron microprobe. The measured lateral homogeneity of the alloy was around 0.1 %. Two dierent photoluminescence lines were observed on Zn(1-x)CdxO alloys. At low temperature, a localized exciton line was identied and a second line appeared at higher energy for intermediate temperatures. This eect is interpreted as a delocalization eect of excitons trapped in potential uctuations related to a local alloy disorder.
Ab-Initio Studies of Electronic and Spectroscopic Properties of MgO, ZnO and CdO
A. Schleife,C. R¨odl,J. Furthmuller,F. Bechstedt,P. H. Jefferson,T. D. Veal,C. F. McConville,L. F. J. Piper,A. DeMasi,K. E. Smith,H. Losch,R. Goldhahn,C. Cobet,J. Zuniga-Perez,V. Munoz-Sanjose 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
We present ab-initio calculations of excited-state properties within single-particle and two-particle approaches in comparison with corresponding experimental results. For the theoretical treatment of the electronic structure, we compute eigenvalues and eigenfunctions by using a spatially nonlocal exchange-correlation potential. From this starting point, quasiparticle energies within the fully frequency-dependent G0W0 approximation are obtained. By solving the Bethe-Salpeter equation, we evaluate optical properties, including the electron-hole attraction and the local-field effects. The results are compared with experimental spectra from soft X-ray emission, as well as from X-ray photoelectron spectroscopy or ellipsometry measurements. In more detail, we compute the valenceband densities of states, bound excitons, and the dielectric function. For the latter, we discuss both the absorption edge and higher critical points.