简介:Theelectronicstructureof(001)polarsurfaceofcubiczirconiawasstudiedbyGGA(WC)approximation.Wefoundthecubiclatticenear(001)surfaceshowedanintensivetendencytotransfertotetragonallattice.Themetallicstateappearedonboththeterminations.ForO-termination,someO2pstateswerevacatedandholecarriersconcentratedonsurfaceoxygen-ions.ForZr-ermination,someZr4dstatesbecamepartialoccupiedforthelossofO2pstates.Weobservedtheholestatesweremainlylocalizedatthecorrespondingionsonsurfaceforboththeterminations,whilethechargestatesonZr-terminationweredispersedonsurface.
简介:在海地.只要提起汉森·普劳舍.几乎人人皆知。他是20世纪初的一名长跑健将。作为运动天才。普劳舍16岁便在体坛崭露头角。并曾一举打破田径类所有项目的纪录。赛场上的他,宛若一匹横空出世的黑马。
简介:TheeffectsofgrowthtimeonthestructureandmorphologyofcubicGaNnucleationlayersonGaAs(001)substratesbymetalorganicchemicalvapordeposition(MOCVD)havebeeninvestigatedusingasynchrotronX-raydiffraction(XRD).TheXRDresultsshowthattheGaN111reflectionsat54.75°inχareameasurablecomponent,howeverthe002reflectionsparalleltoGaAs(001)surfacearenotdetected.TheXRDΦscansandpolefiguresgiveaconvincingproofthattheGaNnucleationlatyersshowexactlythecubicsymmetricalstructure.Thecoherencelengthsalongtheclose-packed<111>directionestuimatedfromthe111peakarenanometerorderofmagnitude,Theoptimalphotoluminescence(PL)spectrumwasobtainedfromthecubicGaNepilayerdepositedonthenucleationlayerfor60sec.