Predicted energy-loss spectrum of low-dimensional plasmons in a metallic strip monolayer on a semiconductor surface
Predicted energy-loss spectrum of low-dimensional plasmons in a metallic strip monolayer on a semiconductor surface
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半导体表面金属条单层中低维等离子体激元的预测能量损失谱
DOI：
10.1103/physrevb.71.115305
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发表时间：
2005
影响因子：
3.7
通讯作者：
T. Inaoka
中科院分区：
文献类型：
--
作者：
T. Inaoka
鉴于高分辨率电子能量损失谱，我们预测了半导体表面金属条单层中低维 sLDd 等离子体激元的能量损失谱。通过与时间相关的局域密度近似，我们计算了电子系统对沿条带表面入射的探针电子的一些典型轨迹的动态响应。正如我们之前的工作所示，LD等离子体激元的能量色散由一系列色散分支组成，其中条带上感应电子密度振荡的节点数随着能量的上升而逐个增加。这些分支会在频谱中产生一系列损耗峰值。当散射平面与表面平面的交线绕带状区域的中心线延伸时，二节点模式的分支产生了显着的损耗峰值，零节点模式对称边缘等离子体和四节点模式的分支也产生了显着的损耗峰值。当交点恰好靠近条带边缘之一时，单节点模式对称边缘等离子体激元的分支会产生显着的损耗峰值。如果电子束照射的表面区域中有足够数量的条带区域，则实际上应该在光谱中观察到这些损耗峰。
In view of high-resolution electron-energy-loss spectroscopy, we predict the energy-loss spectrum of lowdimensional sLDd plasmons in a metallic strip monolayer on a semiconductor surface. By means of the time-dependent local density approximation, we calculate the dynamical response of our electron system to some typical trajectories of a probe electron incident on the surface along the strip. As shown in our previous work, the energy dispersion of the LD plasmons is composed of a series of dispersion branches where the node number in oscillation of the induced electron density across the strip increases one by one with ascending energy. These branches can produce a series of loss peaks in the spectrum. The branch of the two-node modes gives rise to an outstanding loss peak, and the branches of the zero-node modes ssymmetric edge plasmonsd and the four-node modes also create significant loss peaks, when the intersection of the scattering plane with the surface plane runs around the center line of the strip region. The branch of the one-node modes santisymmetric edge plasmonsd yields a remarkable loss peak, when the intersection runs just near one of the strip edges. These loss peaks should actually be observed in the spectrum, if there are a sufficient number of strip regions in a surface area illuminated by an electron beam.