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首页> 外文期刊>Computer physics communications >GREEN FUNCTION FOR CRYSTAL SURFACES .1.
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GREEN FUNCTION FOR CRYSTAL SURFACES .1.

机译:晶体表面的绿色功能.1。

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The described computer code allows to calculate the surface Green function (SGF) of a semi-infinite solid with two-dimensional translational symmetry, using the layer Korringa-Kohn-Rostoker (KKR) approach within the muffin-tin approximation. The crystal is composed from planar or rumpled atomic layers, i.e., the atomic positions within the layer unit cell at the surface may differ from their ideal(bulk) values. The system may be divided into four regions of commensurable, two-dimensional lattice vectors, but with possibly different muffin-tin zeros and geometries: (i) vacuum region, (ii) overlayer, (iii) suriace or subsurface region, (iv) substrate (bulk) region. The unit cell of any layer may be composed of any required number of different atoms. The Green function is evaluated in a spherical-wave expansion up to any maximum quantum number of angular momentum, with basis functions centered at the atomic sites. The following quantities can be computed from the SGF: (i) the electronic charge density, both for given energy E and Bloch vector k(parallel to) and totally, i.e., integrated over E and k(parallel to), and (ii) the local density of states (LDOS), either for a given k(parallel to) and projected onto a given angular momentum, L = (l, m), (partial LDOS) or totally,i.e., integrated over k(parallel to) and summed up over L. [References: 18]
机译:所描述的计算机代码允许使用松饼-锡近似中的层Korringa-Kohn-Rostoker(KKR)方法来计算具有二维平移对称性的半无限固体的表面格林函数(SGF)。晶体由平面或皱折的原子层组成,即表面上层单元内的原子位置可能不同于其理想(批量)值。该系统可分为四个可比较的二维晶格矢量区域,但可能具有不同的松饼锡零点和几何形状:(i)真空区域,(ii)覆盖层,(iii)糖浆或地下区域,(iv)底物(本体)区域。任何层的晶胞可以由任何所需数量的不同原子组成。格林函数在球面波扩展中进行评估,直到角动量的任何最大量子数量,基函数都集中在原子位点上。从SGF可以计算出以下量:(i)给定能量E和Bloch向量k(平行于)以及全部电荷的电子密度,即在E和k(平行于)上积分,和(ii)对于给定的k(平行于)并投影到给定的角动量L =(l,m),(局部LDOS)或全部(即在k上积分)的局部状态密度(LDOS)并总结为L。[参考文献:18]

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